Question

Pipes 'P' and 'Q' can fill a tank in 36 minutes and 72 minutes respectively. A third pipe 'R' can empty it in 1 hour 48 minutes. 'P' and 'R' are turned on together. After 30 minutes, 'Q' is also started. Find how long in total it takes to fill the tank.

A 75 mins
B 27 mins
C 46 mins
D 65 mins
E None of these
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