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 hours will the tank be filled?

3 Answers on this Question

1. 2 hours

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2. 3 hours

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3. 1/x=1/5+1/10+1/30=lcm is 30.
   ->30/5=6
   ->30/10=3
   ->30/30=1
   1/x=6+3+1=10
   1/x=10/30=1/3=x=3
   Ans is 3 hr.

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