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A pool can be filled by one pipe in 9 hours and by a second pipe in 18 hours. How long will it take to fill the pool using both pipes

 Feb 25, 2020
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[1 / 9  +  1 / 18] = 3 / 18  [This means that 3 / 18 of the pool will be filled in 1 hour]

 

So, to fill the entire pool, we simply take the reciprocal of  3/18, which is of course just 18/3=6 hours.

 Feb 25, 2020

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