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A pipe can fill a tank in 5 hours, and a second pipe can fill the same tank in 1

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Question: A pipe can fill a tank in 5 hours, and a second pipe can fill the same tank in 10 hours. If both pipes are opened together, how long will it take to fill the tank?

Options:

  1. 2 hours
  2. 3 hours
  3. 4 hours
  4. 5 hours

Correct Answer: 2 hours

Solution: 

The combined rate is 1/5 + 1/10 = 3/10. Therefore, it will take 10/3 hours or 3.33 hours to fill the tank.

A pipe can fill a tank in 5 hours, and a second pipe can fill the same tank in 1

Practice Questions

Q1
A pipe can fill a tank in 5 hours, and a second pipe can fill the same tank in 10 hours. If both pipes are opened together, how long will it take to fill the tank?
  1. 2 hours
  2. 3 hours
  3. 4 hours
  4. 5 hours

Questions & Step-by-Step Solutions

A pipe can fill a tank in 5 hours, and a second pipe can fill the same tank in 10 hours. If both pipes are opened together, how long will it take to fill the tank?
Correct Answer: 3.33 hours
  • Step 1: Determine the rate at which the first pipe fills the tank. Since it can fill the tank in 5 hours, its rate is 1 tank per 5 hours, or 1/5 of the tank per hour.
  • Step 2: Determine the rate at which the second pipe fills the tank. Since it can fill the tank in 10 hours, its rate is 1 tank per 10 hours, or 1/10 of the tank per hour.
  • Step 3: Add the rates of both pipes together to find the combined rate. This is 1/5 + 1/10.
  • Step 4: To add 1/5 and 1/10, find a common denominator. The common denominator for 5 and 10 is 10. Convert 1/5 to 2/10.
  • Step 5: Now add the two fractions: 2/10 + 1/10 = 3/10.
  • Step 6: The combined rate of both pipes is 3/10 of the tank per hour. This means together they fill 3/10 of the tank in one hour.
  • Step 7: To find out how long it takes to fill the entire tank, take the reciprocal of the combined rate. The reciprocal of 3/10 is 10/3 hours.
  • Step 8: Convert 10/3 hours into a more understandable format. 10/3 hours is approximately 3.33 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 total time taken based on combined rates.
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