state gov Bihar Police Prohibition Constable 2022 Mock Test Series 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