Quantitative Aptitude Time and Work Pipe and Cistern

A pipe can fill a bucket in P hours and another can empty in Q hours. They can together fill it in (Q > P)

1
\(\frac{{{\rm{PQ}}}}{{{\rm{Q}} - {\rm{P}}}}\) hours
2
P – Q hours
3
Q – P hours
4
\(\frac{{{\rm{PQ}}}}{{{\rm{P}} - {\rm{Q}}}}\) hours

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