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A tank is filled by two pipes A and B in 15 hours and 25 hours respectively. If

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Question: A tank is filled by two pipes A and B in 15 hours and 25 hours respectively. If both pipes are opened together, how long will it take to fill the tank?

Options:

  1. 9 hours
  2. 10 hours
  3. 12 hours
  4. 15 hours

Correct Answer: 10 hours

Solution: 

The combined rate is 1/15 + 1/25 = 2/15. Therefore, it will take 15/2 = 7.5 hours to fill the tank.

A tank is filled by two pipes A and B in 15 hours and 25 hours respectively. If

Practice Questions

Q1
A tank is filled by two pipes A and B in 15 hours and 25 hours respectively. If both pipes are opened together, how long will it take to fill the tank?
  1. 9 hours
  2. 10 hours
  3. 12 hours
  4. 15 hours

Questions & Step-by-Step Solutions

A tank is filled by two pipes A and B in 15 hours and 25 hours respectively. If both pipes are opened together, how long will it take to fill the tank?
Correct Answer: 7.5 hours
  • Step 1: Determine the rate at which pipe A fills the tank. Since it fills the tank in 15 hours, its rate is 1/15 of the tank per hour.
  • Step 2: Determine the rate at which pipe B fills the tank. Since it fills the tank in 25 hours, its rate is 1/25 of the tank per hour.
  • Step 3: Add the rates of both pipes together to find the combined rate. This is done by calculating 1/15 + 1/25.
  • Step 4: To add the fractions, find a common denominator. The least common multiple of 15 and 25 is 75.
  • Step 5: Convert 1/15 to have a denominator of 75: (1/15) * (5/5) = 5/75.
  • Step 6: Convert 1/25 to have a denominator of 75: (1/25) * (3/3) = 3/75.
  • Step 7: Now add the two fractions: 5/75 + 3/75 = 8/75.
  • Step 8: The combined rate of both pipes is 8/75 of the tank per hour.
  • Step 9: To find out how long it takes to fill the tank, take the reciprocal of the combined rate: 1 / (8/75) = 75/8 hours.
  • Step 10: Simplify 75/8 to get the time in hours: 75/8 = 9.375 hours, which is 9 hours and 22.5 minutes.
  • Work Rate – Understanding how to calculate the combined work rate of multiple entities working together.
  • Fraction Addition – Adding fractions to determine the total rate of work done by the pipes.
  • Time Calculation – Calculating the time taken to complete a task based on the combined work rate.
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