Question

Pipe ‘A’ takes 10 minutes to fill a tank. Pipe ‘B’ takes 20 minutes to empty the same tank. If pipe ‘B’ is opened 5 minutes after pipe ‘A’, then find the total time taken to fill the tank in this manner.

A 10 minutes
B 12 minutes
C 15 minutes
D 17 minutes
E 20 minutes
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