Pipes and Cistern - Quantitative Aptitude (MCQ) questions for Q. 20536

Q.  Two pipes P and Q can fill a tank in 10 hours and 14 hours respectively. If both pipes are opened simultaneously, how much time will be taken to fill the tank?
- Published on 07 Jul 17

a. 4 hours 20 min
b. 5 hours 49 min
c. 3 hours 50 min
d. 3 hours 22 min

ANSWER: 5 hours 49 min
 
Part filled by P in 1 hour = 1/10
Part filled by Q in 1 hour = 1/14
Part filled by (P + Q) in 1 hour = ( 1/10 + 1/14) = (6/35)
Time taken to fill the tank is (35/6) = 5 hours 49 min

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