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A tank can be filled by a pipe in 15 hours and emptied by another pipe in 25 hou

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Question: A tank can be filled by a pipe in 15 hours and emptied by another pipe in 25 hours. If both pipes are opened together, how long will it take to fill the tank?

Options:

  1. 10 hours
  2. 12 hours
  3. 15 hours
  4. 20 hours

Correct Answer: 12 hours

Solution: 

The net rate is 1/15 - 1/25 = 1/75. Therefore, it will take 75 hours to fill the tank.

A tank can be filled by a pipe in 15 hours and emptied by another pipe in 25 hou

Practice Questions

Q1
A tank can be filled by a pipe in 15 hours and emptied by another pipe in 25 hours. If both pipes are opened together, how long will it take to fill the tank?
  1. 10 hours
  2. 12 hours
  3. 15 hours
  4. 20 hours

Questions & Step-by-Step Solutions

A tank can be filled by a pipe in 15 hours and emptied by another pipe in 25 hours. If both pipes are opened together, how long will it take to fill the tank?
Correct Answer: 75 hours
  • Step 1: Determine the rate at which the filling pipe works. It fills the tank in 15 hours, so its rate is 1 tank per 15 hours, or 1/15 of the tank per hour.
  • Step 2: Determine the rate at which the emptying pipe works. It empties the tank in 25 hours, so its rate is 1 tank per 25 hours, or 1/25 of the tank per hour.
  • Step 3: Calculate the net rate when both pipes are opened together. This is done by subtracting the emptying rate from the filling rate: (1/15) - (1/25).
  • Step 4: To subtract these fractions, find a common denominator. The least common multiple of 15 and 25 is 75.
  • Step 5: Convert the rates to have the common denominator of 75: (1/15 = 5/75) and (1/25 = 3/75).
  • Step 6: Now subtract the two rates: (5/75) - (3/75) = (5 - 3)/75 = 2/75.
  • Step 7: The net rate of filling the tank is 2/75 of the tank per hour.
  • Step 8: To find out how long it takes to fill the entire tank, take the reciprocal of the net rate: 1 / (2/75) = 75/2 = 37.5 hours.
  • Rate of Work – Understanding how to calculate the rate at which a tank is filled or emptied by different pipes.
  • Combined Work Rate – Calculating the net effect of multiple processes working together, such as filling and emptying a tank.
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