Pipes and Cistern - Quantitative Aptitude (MCQ) questions for Q. 20759

Q.  Pipe P can fill a tank in 4 hours, pipe Q in 8 hours and pipe R in 24 hours. If all the pipes are open, in how many hours will the tank be filled?
- Published on 07 Jul 17

a. 2 hours
b. 2.4 hours
c. 3 hours
d. 3.5 hours

ANSWER: 2.4 hours
 
Part filled by (P + Q + R) in 1 hour = (1/4 + 1/8 + 1/24) = 10/24
All the three pipes together will fill the tank = 24/10 = 2.4 hours

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