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If a pipe can fill a tank in 25 minutes and another pipe can empty it in 50 minu

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Question: If a pipe can fill a tank in 25 minutes and another pipe can empty it in 50 minutes, how long will it take to fill the tank if both pipes are opened together?

Options:

  1. 15 minutes
  2. 20 minutes
  3. 25 minutes
  4. 30 minutes

Correct Answer: 30 minutes

Solution: 

The net rate is 1/25 - 1/50 = 1/50. Therefore, it will take 50 minutes to fill the tank.

If a pipe can fill a tank in 25 minutes and another pipe can empty it in 50 minu

Practice Questions

Q1
If a pipe can fill a tank in 25 minutes and another pipe can empty it in 50 minutes, how long will it take to fill the tank if both pipes are opened together?
  1. 15 minutes
  2. 20 minutes
  3. 25 minutes
  4. 30 minutes

Questions & Step-by-Step Solutions

If a pipe can fill a tank in 25 minutes and another pipe can empty it in 50 minutes, how long will it take to fill the tank if both pipes are opened together?
Correct Answer: 50 minutes
  • Step 1: Determine the rate at which the first pipe fills the tank. It fills the tank in 25 minutes, so its rate is 1 tank per 25 minutes, or 1/25 of the tank per minute.
  • Step 2: Determine the rate at which the second pipe empties the tank. It empties the tank in 50 minutes, so its rate is 1 tank per 50 minutes, or 1/50 of the tank per minute.
  • Step 3: Calculate the net rate when both pipes are opened together. The first pipe fills at a rate of 1/25 and the second pipe empties at a rate of 1/50. So, the net rate is 1/25 - 1/50.
  • Step 4: Find a common denominator to subtract the rates. The common denominator for 25 and 50 is 50. Convert 1/25 to 2/50. Now, subtract: 2/50 - 1/50 = 1/50.
  • Step 5: The net rate of filling the tank is 1/50 of the tank per minute. This means it takes 50 minutes to fill the entire tank when both pipes are open.
  • Rate of Work – Understanding how to calculate the rate at which pipes fill or empty a tank.
  • Combined Rates – Calculating the net effect of multiple rates working together (filling and emptying).
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