how long will it take using both pipes to fill the pool

Algebra
Tutor: None Selected Time limit: 1 Day

a pool can be filled be one pipe in 9 hours and by a second pipe in 5 hours. how long will it take using both pipes to fill the pool?

May 12th, 2015

Add the same hours both pipes take to fill the pool

1/9+1/5=14/45

Get the reciprocal of the fraction

45/14=3 3/14

thus it take 3 3/14 hours for the pipes to fill the pool together.

May 12th, 2015

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May 12th, 2015
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