Question

Two inlet pipes 'A' and 'B' can fill an empty tank in 60 minutes and 120 minutes, respectively. Another outlet pipe 'C' can empty the tank in 240 minutes. If all the three pipes are opened together, then find the time taken by them to fill the tank.

A 45 minutes
B 46 minutes
C 47 minutes
D 48 minutes
E 49 minutes
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