Question

Pipes X and Y can fill a water tank individually in 24 minutes and 36 minutes, respectively. A third pipe Z can empty the tank in 72 minutes. If all three pipes are opened at the same time, how long (in seconds) will it take to fill the tank?

A 2571 secs
B 1332 secs
C 1080 secs
D 1200 secs
E None of these
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