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1. One pipe can fill a pool in 6 hours and a second pipe can fill the same pool in 12 hours. If both pipes work together, how long will it take to fill the pool?

  • A. 4 hours
  • B. 4 hours
  • C. 4 hours
  • D. 4 hours

Answer: Option A

Explanation:

First pipe can fill 1/6 of the pool in an hour

Second pool can fill 1/12 of the pool in an hour

Together they can fill (1/6 + 1/12) or 1/4 of the pool in an hour

So, they can fill the pool completely in 4 hours.

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