Question

Three pipes are attached to a tank. Pipe A can fill it in 20 minutes, pipe B can fill it in 30 minutes, while pipe C can empty the completely filled tank in 15 minutes. If pipe A is opened first, pipe B is opened 5 minutes after pipe A and pipe C is opened 10 minutes after pipe A, find the total time taken to fill the tank.

A 18 min
B 20 min
C 22 min
D 25 min
E 30 min
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