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2014-08-21T16:53:07+08:00

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Pipe A can fill  \frac{1}{10} of the pool in an hour
Pipe A and B together can fill  \frac{1}{4} of the pool in an hour
Pipe B can fill
 \frac{1}{4} - \frac{1}{10} = \frac{5-2}{20} = \frac{3}{20} of the pool in an hour

Pipe B will take  \frac{20}{3} =6 \frac{2}{3} hours or 6 hours and 40 minutes alone
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