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profileNayak satish
asked 2020-04-05 09:05:57 
Two pipes A and B can fill a tank in $12$ hours and $15$ hours respectively. If both pipes are opened together in an empty tank, how much time will it take to fill it?
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profiledev
answered 2020-04-05 16:05:39 

$\dfrac{12×15}{12+15}=6\dfrac{2}{3}$

Required time $=6\dfrac{2}{3}$ hours

See problems given here for different ways of solving such problems

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