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# TCS Written Test Qs.(Quantitative Aptitude) :: Pipes & Cistern - Discussion

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## 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?

A17 hours

B5 hours

C7 hours

D7 1/2 hours

Answer: Option (Login/Signup)

Show Explanation

Tank filled by B in 3 hours=1/16

B fills double amount than in previous hour (from Given series 10,20,40,80,160)

So in 4 hours tank filled=2/16

In 5 hours tank filled=2*2/16=4/16

In 6 hours tank filled=2*4/16=8/16

In 7 hours tank filled=16/16=1

So, it took 7 hours to fill the tank

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