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Arithmetic Ability
Pipes and Cistern

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Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively. Both the pipes are opened together but after 4 minutes, pipe A is turned off. What is the total time required to fill the tank?

A. 10 min. 20 sec.

B. 11 min. 45 sec.

C. 12 min. 30 sec.

D. 14 min. 40 sec.

View Answer

Correct choice: D

Explanation:

Part filled in 4 minutes =4(1/15+1/20) = 7/15 Remaining part =(1-7/15) = 8/15 Part filled by B in 1 minute =1/20 : 8/15 :: 1:x x = (8/15*1*20) = 10 2 3 min = 10min 40sec 1023min = 10min 40sec The tank will be full in (4 min. + 10 min. + 40 sec.) = 14 min. 40 sec

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Arithmetic Ability Pipes and Cistern

Arithmetic Ability
Pipes and Cistern