Question

a small pump can drain a pool in 7 hours. a large pump could drain the same pool in 2 hours. how long will it take to drain the pool of both pumps are used simultaneously

Answer 1

It would take about 5 hours. 
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Answer 2

Time together over time alone + Time together over time alone=1
X/7+X/2=1
X =1.56 hrs

2x/14 + 7x/14=14/14

2x+7x=14
9x=14
X= 14/9
X=