Pipe A can fill a tank in 5 hours, pipe B in 10 hours and pipe C in 30 hours. If all the pipes are open, in how many will the tank be filled?

Pipe A can fill a tank in 5 hours, pipe B in 10 hours and pipe C in 30 hours. If all the pipes are open, in how many will the tank be filled? Correct Answer 3

Hints: Pipe A, B, and C can fill the tank in 1 hour ( 1/5 + 1/10 + 1/30) portion = (12 + 6 + 2)/6o portion = 20/60 portion = 1/3 portion All three pipes will fill the tank in 3 hours.
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