Question

An inlet pipe A can fill a tank in x minutes, while an outlet pipe B can empty the fully filled tank in (x − 4) minutes. If both pipes are opened together, they can empty a fully filled tank in 63 minutes. Find the time taken by pipe A alone to completely fill the tank.

A 12 minutes
B 15 minutes
C 18 minutes
D 20 minutes
E 10 minutes
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