Question

Pipe A can fill 50% of a tank in 4 hours and pipe B can completely fill the same tank in 12 hours. If both the pipes are opened at the same time, then in how much time will the empty tank be completely filled?

A 4 hours 40 minutes
B 4 hours 48 minutes
C 4 hours 52 minutes
D 4 hours 55 minutes
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