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There are two water tanks A and B, A is much smaller than B. While water fills at the rate of 1 liter every hour in A, it gets filled up like, 10, 20, 40, 80, 160 in tank B. (At the end of first hour, B has 10 liters, second hour it has 20 liters and so on). If tank B is 1/4 filled of the 10 hours, what is total duration of hours required to fill it completely?
  • a)
    12
  • b)
    25
  • c)
    05
  • d)
    27
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
There are two water tanks A and B, A is much smaller than B. While wat...
Problem Solving Strategy:
We need to calculate the total time taken to fill the tank B completely. We can do so by finding out how much water is filled in B in one hour and then calculate the total time required to fill it up completely.

Given Information:
Rate of filling of tank A = 1 liter/hour
Rate of filling of tank B = 10, 20, 40, 80, 160 liters in 1 hour, 2 hours, 4 hours, 8 hours, and 16 hours respectively.
Tank B is 1/4 filled in 10 hours.

Solution:
Let's find out how much water is filled in tank B in one hour. We can see that the amount of water filled in tank B is increasing in the form of a geometric progression with the common ratio of 2.

So, the amount of water filled in tank B in one hour is:

10+20+40+80+160 = 310 liters.

Now, we know that tank B is 1/4 filled in 10 hours. So, the amount of water filled in tank B in 10 hours is:

1/4 × Capacity of Tank B = 1/4 × (10+20+40+80+160+320+640+1280+2560+5120) = 2047.5 liters.

Therefore, the amount of water that will be filled in tank B in the next hour will be:

2047.5 + 310 = 2357.5 liters.

Similarly, we can find out the amount of water that will be filled in tank B in each subsequent hour until it is completely filled.

Let's make a table to represent this:

| Time (in hours) | Amount of water filled (in liters) |
|----------------|-----------------------------------|
| 1 | 310 |
| 2 | 620 |
| 3 | 1240 |
| 4 | 2480 |
| 5 | 4960 |
| 6 | 9920 |
| 7 | 19840 |
| 8 | 39680 |
| 9 | 79360 |
| 10 | 158720 |
| 11 | 317440 |

Therefore, the tank B will be completely filled in 12 hours.

Hence, the correct answer is option 'A'.
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There are two water tanks A and B, A is much smaller than B. While water fills at the rate of 1 liter every hour in A, it gets filled up like, 10, 20, 40, 80, 160 in tank B. (At the end of first hour, B has 10 liters, second hour it has 20 liters and so on). If tank B is 1/4 filled of the 10 hours, what is total duration of hours required to fill it completely?a)12b)25c)05d)27Correct answer is option 'A'. Can you explain this answer?
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