Pipe 'P' can fill a tank in 36 hours and pipe 'Q

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Railways JE

38

M: +4.00/-0.00

Pipe 'P' can fill a tank in 36 hours and pipe 'Q' can fill this tank in 45 hours. If both the pipes are opened simultaneously, then how much time will be taken to fill this tank ?

[RRB JE 2015]

A 20 hours

B

C 9 hours

D 42 hours