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Arithmetic Aptitude :: Pipes & Cistern

9. There are two pipes A and B. If A filled 10 liters in hour B can fills 20 liters in same time. Likewise B can fill 10, 20, 40, 80,160. If B filled in (1/16) th of a tank in 3 hours, how much time will it take to fill completely?

Answer: Option C

Explanation :

B is filling twice in a hour.

In 3hrs it fills 1/16th of tank.

so after 4hr(3hrs+1hr)=(1*2)/16=1/8th

similarly after 5hrs=(1*2)/8=1/4th

after 6hrs=(1*2)/4=1/2th

after 7hrs=(1*2)/2=1(hence tank is full)


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