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Pipe A can fill a tank in 15 hours, while pipe B can fill it in 10 hours. If bot

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Question: Pipe A can fill a tank in 15 hours, while pipe B can fill it in 10 hours. If both pipes are opened together, how long will it take to fill the tank?

Options:

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

Correct Answer: 5 hours

Solution: 

The combined rate is 1/15 + 1/10 = 1/6. Therefore, it will take 6 hours to fill the tank.

Pipe A can fill a tank in 15 hours, while pipe B can fill it in 10 hours. If bot

Practice Questions

Q1
Pipe A can fill a tank in 15 hours, while pipe B can fill it in 10 hours. If both pipes are opened together, how long will it take to fill the tank?
  1. 4 hours
  2. 5 hours
  3. 6 hours
  4. 7 hours

Questions & Step-by-Step Solutions

Pipe A can fill a tank in 15 hours, while pipe B can fill it in 10 hours. If both pipes are opened together, how long will it take to fill the tank?
Correct Answer: 6 hours
  • Step 1: Determine the rate at which Pipe A fills the tank. Since Pipe A can fill 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 Pipe B can fill the tank in 10 hours, its rate is 1/10 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 + 1/10.
  • Step 4: To add 1/15 and 1/10, find a common denominator. The least common multiple of 15 and 10 is 30.
  • Step 5: Convert 1/15 to 2/30 and 1/10 to 3/30.
  • Step 6: Now add the two fractions: 2/30 + 3/30 = 5/30.
  • Step 7: Simplify 5/30 to 1/6. This means together, both pipes can fill 1/6 of the tank in one hour.
  • Step 8: To find out how long it takes to fill the entire tank, take the reciprocal of 1/6, which is 6 hours.
  • Work Rate – Understanding how to calculate the combined work rate of two or more entities working together.
  • Fraction Addition – Applying the concept of adding fractions to find a common rate of work.
  • Time Calculation – Determining the time taken to complete a task based on the combined work rate.
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