Pipe P can fill a tank in 8 hours, pipe Q in 12 hours and pipe R in 20 hours.

Pipe P can fill a tank in 8 hours, pipe Q in 12 hours and pipe R in 20 hours. If all the pipes are open, in how many hours will the tank be filled?

Quiz

Answer/Solution

3.8 hours

Steps/Work

Explanation:
Part filled by (P + Q + R) in 1 hour = (1/8 + 1/12 + 1/20) = 31/120
All the three pipes together will fill the tank = 120/31 = 3.8 hours
ANSWER C

Physics Calculator / Auto Solver

Pipe p can fill a tank in hours, pipe q in hours and pipe r in hours. If all the pipes are open, in how many hours will the tank be filled?

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