Directions: Use the following information:Q started to move from poin...
Problem Analysis:
Let's assume that the distance between point A and point B is 'd' units. We are given that Q's speed is twice that of P. Let's assume that P's speed is 'x' units per hour. Therefore, Q's speed will be '2x' units per hour. We are also given that Q started moving exactly an hour after P started. This means that Q had already covered the same distance as P in that one hour.
Distance Covered by P:
Let's assume that P takes 't' hours to reach point B. Therefore, in that 't' hours, P will cover 'x * t' units of distance.
Distance Covered by Q:
Since Q's speed is twice that of P, Q will cover '2x * t' units of distance in the same 't' hours.
Distance Covered by P and Q in the First Hour:
In the first hour, P covers 'x' units of distance. Since Q started moving after an hour, Q must have covered the same distance as P in that one hour. Therefore, Q also covers 'x' units of distance in the first hour.
Total Distance Covered by P and Q:
Since P and Q both cover the same distance in the first hour, the total distance covered by P and Q is 'x + x = 2x' units.
Distance Covered by P when Q Covers the Same Distance:
We are given that when P had covered one-sixth of the distance between points A and B, Q had also covered the same distance. Let's assume that when P had covered one-sixth of the distance, it had taken 't' hours. Therefore, the distance covered by P in 't' hours is 'x * t'. Since Q also covered the same distance in 't' hours, the distance covered by Q is '2x * t'.
Equating the Distances Covered by P and Q:
We have the following equation: 'x * t = 2x * t'. Simplifying this equation, we get 't = 2t'. This equation is only true when 't' is equal to zero, which is not possible in this case. Therefore, 't' must be a non-zero value.
Conclusion:
Since 't' cannot be zero, we conclude that 't' must be infinite or undefined. This means that P will never reach point B. Therefore, the correct answer is option 'D' - 12 hours.
Directions: Use the following information:Q started to move from poin...
Let speed of P = x, Q = 2x
1 hour after Q started, Q would have covered a distance 2x, and P also 2x
Also, the only time when both P & Q would have covered the same distance would be after 1 hour (After this Q would always have covered mored distance than P)
Using the above statement, and the question statement, 1/6th distance = distance covered by P in 2 hours
So P will take 6x2 = 12 hours
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