Six pipes are fitted to a tank. Some of these are filler pipes and some are o

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Six pipes are fitted to a tank. Some of these are filler pipes and some are outlet pipes. Each filler pipe can fill the tank in 8 hours and each outlet pipe can drain off the water in 12 hours. On opening all the pipes, an empty tank is filled in 3 hours. Find the number of filler pipes.

Options:

A . 2

B . 3

C . 4

D . 5

Answer: Option C

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