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Two pipes can fill a tank in 20 hours and 30 hours respectively. If both pipes a

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Question: Two pipes can fill a tank in 20 hours and 30 hours respectively. If both pipes are opened together, how long will it take to fill the tank?

Options:

  1. 12 hours
  2. 15 hours
  3. 18 hours
  4. 20 hours

Correct Answer: 15 hours

Solution: 

The combined rate is 1/20 + 1/30 = 3/60 + 2/60 = 5/60. Thus, it will take 60/5 = 12 hours.

Two pipes can fill a tank in 20 hours and 30 hours respectively. If both pipes a

Practice Questions

Q1
Two pipes can fill a tank in 20 hours and 30 hours respectively. If both pipes are opened together, how long will it take to fill the tank?
  1. 12 hours
  2. 15 hours
  3. 18 hours
  4. 20 hours

Questions & Step-by-Step Solutions

Two pipes can fill a tank in 20 hours and 30 hours respectively. If both pipes are opened together, how long will it take to fill the tank?
  • Rate of Work – Understanding how to calculate the rate at which each pipe fills the tank and how to combine these rates.
  • Combined Work Rate – Applying the concept of adding rates to find the total work done when multiple entities are working together.
  • Time Calculation – Using the combined rate to determine the total time required to complete the task.
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