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A tank can be filled by a pipe in 40 minutes and emptied by another pipe in 60 m

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Question: A tank can be filled by a pipe in 40 minutes and emptied by another pipe in 60 minutes. If both pipes are opened together, how long will it take to fill the tank?

Options:

  1. 20 minutes
  2. 30 minutes
  3. 40 minutes
  4. 50 minutes

Correct Answer: 30 minutes

Solution: 

The net rate is 1/40 - 1/60 = 1/120. Therefore, it will take 120 minutes to fill the tank.

A tank can be filled by a pipe in 40 minutes and emptied by another pipe in 60 m

Practice Questions

Q1
A tank can be filled by a pipe in 40 minutes and emptied by another pipe in 60 minutes. If both pipes are opened together, how long will it take to fill the tank?
  1. 20 minutes
  2. 30 minutes
  3. 40 minutes
  4. 50 minutes

Questions & Step-by-Step Solutions

A tank can be filled by a pipe in 40 minutes and emptied by another pipe in 60 minutes. If both pipes are opened together, how long will it take to fill the tank?
Correct Answer: 120 minutes
  • Step 1: Understand that one pipe fills the tank and the other pipe empties it.
  • Step 2: Determine the rate at which the filling pipe works. It fills the tank in 40 minutes, so its rate is 1 tank per 40 minutes, or 1/40 tanks per minute.
  • Step 3: Determine the rate at which the emptying pipe works. It empties the tank in 60 minutes, so its rate is 1 tank per 60 minutes, or 1/60 tanks per minute.
  • Step 4: Calculate the net rate when both pipes are open. This is done by subtracting the emptying rate from the filling rate: (1/40) - (1/60).
  • Step 5: To subtract these fractions, find a common denominator. The least common multiple of 40 and 60 is 120.
  • Step 6: Convert the rates to have the common denominator: (1/40) = (3/120) and (1/60) = (2/120).
  • Step 7: Now subtract the two rates: (3/120) - (2/120) = (1/120).
  • Step 8: The net rate of filling the tank is 1/120 tanks per minute.
  • Step 9: To find out how long it takes to fill 1 tank, take the reciprocal of the net rate: 1 / (1/120) = 120 minutes.
  • Rate of Work – Understanding how to calculate the rate at which work is done when multiple processes are involved, such as filling and emptying a tank.
  • Combined Rates – Calculating the net effect of two opposing rates (filling and emptying) to determine the overall rate of filling the tank.
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