Question

Pipes A, B, and C can fill a tank in 30 minutes, 45 minutes, and 60 minutes respectively. All the pipes are opened together. A is closed after  n minutes, and B is closed  (2n - 2) minutes before the tank is filled. If the tank is filled in 28 minutes, find the value of  n.

A 14
B 12
C 18
D 16
E None of these
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