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Abe and Beth both start from a common point and travel in different directions towards their respective destinations. Abe’s
average speed is 25% greater than Beth’s average speed but Abe needs to cover 50% greater distance than Beth. Which of the
following is closest to the percentage by which the travel time of Beth lesser than that of Abe?
  • a)
    17%
  • b)
    20%
  • c)
    25%
  • d)
    40%
  • e)
    60%
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
Abe and Beth both start from a common point and travel in different di...
Given:
  • Let Abe’s Average Speed, Distance covered and Time taken be S , D and T respectively
  • Let Beth’s Average Speed, Distance covered and Time taken be S , D and T respectively
​
To Find: approx. % by which TB is lesser than
 
Approach:
  1. % by which T is lesser than  
  2. So, to answer the question, we need to find:
    • Either the values of TA and TB
    • Or TA in terms of TB
  3. Using the given relations between S and S , and between DA and DB , we’ll express T in terms of T and hence, answer the question
Working out:
  • So, % by which TA is lesser than TB =
​
Looking at the answer choices, we see that Option A is correct
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Most Upvoted Answer
Abe and Beth both start from a common point and travel in different di...
Problem: Abe and Beth both start from a common point and travel in different directions towards their respective destinations. Abe's average speed is 25% greater than Beth's average speed but Abe needs to cover 50% greater distance than Beth. Which of the following is closest to the percentage by which the travel time of Beth lesser than that of Abe?

Solution:

Let's assume that Beth's average speed is 'S' and she covers a distance of 'D' to reach her destination.

According to the problem, Abe's average speed is 25% greater than Beth's average speed. So, Abe's average speed will be:

Abe's average speed = S + 0.25S = 1.25S

Also, Abe needs to cover 50% greater distance than Beth. So, Abe's distance will be:

Abe's distance = D + 0.5D = 1.5D

Now, we can calculate the time taken by Beth and Abe to reach their respective destinations.

Time taken by Beth = Distance / Speed = D / S

Time taken by Abe = Distance / Speed = 1.5D / 1.25S = 6D / 5S

So, the percentage by which the travel time of Beth is lesser than that of Abe can be calculated as:

Percentage = [(Time taken by Abe - Time taken by Beth) / Time taken by Abe] x 100

Percentage = [(6D / 5S - D / S) / (6D / 5S)] x 100

Percentage = [(5D / 5S) / (6D / 5S)] x 100

Percentage = (5/6) x 100

Percentage = 83.33%

Therefore, the closest option to the percentage by which the travel time of Beth is lesser than that of Abe is option 'A' which is 17%.
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One of the foundations of scientific research is that an experimental result is credible only if it can be replicated—only if performing the experiment a second time leads to the same result. But physicists John Sommerer and Edward Ott have conceived of a physical system in which even the least change in the starting conditions—no matter how small, inadvertent, or undetectable—can alter results radically. The system is represented by a computer model of a mathematical equation describing the motion of a particle placed in a particular type of force field.Sommerer and Ott based their system on an analogy with the phenomena known as riddled basins of attraction. If two bodies of water bound a large landmass and water is spilled somewhere on the land, the water will eventually make its way to one or the other body of water, its destination depending on such factors as where the water is spilled and the geographic features that shape the water’s path and velocity. The basin of attraction for a body of water is the area of land that, whenever water is spilled on it, always directs the spilled water to that body.In some geographical formations it is sometimes impossible to predict, not only the exact destination of the spilled water, but even which body of water it will end up in. This is because the boundary between one basin of attraction and another is riddled with fractal properties; in other words, the boundary is permeated by an extraordinarily high number of physical irregularities such as notches or zigzags. Along such a boundary, the only way to determine where spilled water will flow at any given point is actually to spill it and observe its motion; spilling the water at any immediately adjacent point could give the water an entirely different path, velocity, or destination.In the system posited by the two physicists, this boundary expands to include the whole system: i.e., the entire force field is riddled with fractal properties, and it is impossible to predict even the general destination of the particle given its starting point. Sommerer and Ott make a distinction between this type of uncertainty and that known as “chaos”; under chaos, a particle’s general destination would be predictable but its path and exact destination would not.There are presumably other such systems because the equation the physicists used to construct the computer model was literally the first one they attempted, and the likelihood that they chose the only equation that would lead to an unstable system is small. If other such systems do exist, metaphorical examples of riddled basins of attraction may abound in the failed attempts of scientists to replicate previous experimental results—in which case, scientists would be forced to question one of the basic principles that guide their work.According to the passage, Sommerer and Ott’s model differs from a riddled basin of attraction in which one of the following ways?

One of the foundations of scientific research is that an experimental result is credible only if it can be replicated—only if performing the experiment a second time leads to the same result. But physicists John Sommerer and Edward Ott have conceived of a physical system in which even the least change in the starting conditions—no matter how small, inadvertent, or undetectable—can alter results radically. The system is represented by a computer model of a mathematical equation describing the motion of a particle placed in a particular type of force field.Sommerer and Ott based their system on an analogy with the phenomena known as riddled basins of attraction. If two bodies of water bound a large landmass and water is spilled somewhere on the land, the water will eventually make its way to one or the other body of water, its destination depending on such factors as where the water is spilled and the geographic features that shape the water’s path and velocity. The basin of attraction for a body of water is the area of land that, whenever water is spilled on it, always directs the spilled water to that body.In some geographical formations it is sometimes impossible to predict, not only the exact destination of the spilled water, but even which body of water it will end up in. This is because the boundary between one basin of attraction and another is riddled with fractal properties; in other words, the boundary is permeated by an extraordinarily high number of physical irregularities such as notches or zigzags. Along such a boundary, the only way to determine where spilled water will flow at any given point is actually to spill it and observe its motion; spilling the water at any immediately adjacent point could give the water an entirely different path, velocity, or destination.In the system posited by the two physicists, this boundary expands to include the whole system: i.e., the entire force field is riddled with fractal properties, and it is impossible to predict even the general destination of the particle given its starting point. Sommerer and Ott make a distinction between this type of uncertainty and that known as “chaos”; under chaos, a particle’s general destination would be predictable but its path and exact destination would not.There are presumably other such systems because the equation the physicists used to construct the computer model was literally the first one they attempted, and the likelihood that they chose the only equation that would lead to an unstable system is small. If other such systems do exist, metaphorical examples of riddled basins of attraction may abound in the failed attempts of scientists to replicate previous experimental results—in which case, scientists would be forced to question one of the basic principles that guide their work.The discussion of the chaos of physical systems is intended to perform which one of the following functions in the passage?

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Abe and Beth both start from a common point and travel in different directions towards their respective destinations. Abe’saverage speed is 25% greater than Beth’s average speed but Abe needs to cover 50% greater distance than Beth. Which of thefollowing is closest to the percentage by which the travel time of Beth lesser than that of Abe?a)17%b)20%c)25%d)40%e)60%Correct answer is option 'A'. Can you explain this answer?
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