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Two pipes can fill a tank in 9 hours and 12 hours respectively. If both pipes ar

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Question: Two pipes can fill a tank in 9 hours and 12 hours respectively. If both pipes are opened together, how long will it take to fill the tank?

Options:

  1. 4.5 hours
  2. 5 hours
  3. 6 hours
  4. 7 hours

Correct Answer: 6 hours

Solution: 

The combined rate is 1/9 + 1/12 = 7/36. Therefore, it will take 36/7 = 5.14 hours to fill the tank.

Two pipes can fill a tank in 9 hours and 12 hours respectively. If both pipes ar

Practice Questions

Q1
Two pipes can fill a tank in 9 hours and 12 hours respectively. If both pipes are opened together, how long will it take to fill the tank?
  1. 4.5 hours
  2. 5 hours
  3. 6 hours
  4. 7 hours

Questions & Step-by-Step Solutions

Two pipes can fill a tank in 9 hours and 12 hours respectively. If both pipes are opened together, how long will it take to fill the tank?
Correct Answer: 5.14 hours
  • Step 1: Determine the rate at which each pipe fills the tank. The first pipe fills the tank in 9 hours, so its rate is 1/9 of the tank per hour.
  • Step 2: The second pipe fills the tank in 12 hours, so its rate is 1/12 of the tank per hour.
  • Step 3: Add the rates of both pipes together to find the combined rate. This is 1/9 + 1/12.
  • Step 4: To add 1/9 and 1/12, find a common denominator. The least common multiple of 9 and 12 is 36.
  • Step 5: Convert 1/9 to 4/36 and 1/12 to 3/36. Now add them: 4/36 + 3/36 = 7/36.
  • Step 6: The combined rate of both pipes is 7/36 of the tank per hour.
  • Step 7: To find out how long it takes to fill the tank, take the reciprocal of the combined rate. This means you calculate 1 divided by (7/36).
  • Step 8: The calculation is 36/7, which equals approximately 5.14 hours.
  • Rate of Work – Understanding how to calculate the combined work rate of multiple entities working together.
  • Fraction Addition – Adding fractions to find a common rate of work.
  • Time Calculation – Calculating the time taken to complete a task based on the combined rate.
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