Question

Two inlet pipes 'A' and 'B' can fill an empty tank in 25 minutes and 50 minutes, respectively. Another outlet pipe 'C' can empty the tank in 100 minutes. If all the three pipes are opened together, then find the time taken by them to fill the tank.

A 18 minutes
B 19 minutes
C 20 minutes
D 21 minutes
E 22 minutes
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