Question

Two pipes P1 and P2 can fill a cistern in 12 minutes and 15 minutes respectively. These pipes are opened alternately for 1 minute each, beginning with pipe P1. In what time will the cistern be full?

A 13 min 20 seconds
B 12 min 30 seconds
C 10 min 20 seconds
D 11 min 15 seconds
E None of these
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