Question

Pipe ‘A’ takes 30 minutes to fill a tank. Pipe ‘B’ takes 40 minutes to empty the same tank. If pipe ‘B’ is opened 20 minutes after pipe ‘A’, then find the total time taken to fill the tank in this manner.

A 61 minutes
B 63 minutes
C 64 minutes
D 60 minutes
E 70 minutes
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