Question

Tap P can fill a water tank in 15 minutes, Tap Q can fill it in 20 minutes, and Tap R can empty half of the tank in 15 minutes. Now, if all the taps, P, Q, and R, are opened simultaneously, with the unique ability that Tap R starts to empty the tank after the first minute, how long will it take to completely fill the water tank

A 15 min 36 seconds
B 25 min 36 seconds
C 11 minutes 36 seconds
D 10 min 36 seconds
E none of these
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