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Quantitative Aptitude :: Pipes & Cistern - Discussion

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Choose the correct option.

If a pipe can fill the tank within 6hrs.But due to leak it takes 30 min more. Now the tank is full then how much time will it take to empty the tank through the leak?

A78

B56

C66

D59

Answer: Option (Login/Signup)

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Pipe A takes 6 hours to fill the tank. Therefore, it fills 1/6th of the tank in an hour or 16.66% of the tank in an hour.



When there is a leak it takes 6 hours 30 minutes for the tank to fill. i.e 13/2 hrs hours to fill the tank or 2/13th or 15.38% of the tank gets filled in 1 hr.

On account of the leak, (16.66−15.38)%=1.28% of the water gets wasted every hour. Therefore, the leak will take 100/1.28 i.e 78.125 hrs to drain a full tank.

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