Latest Bank Exam Aptitude Question SOLUTION: A pipe can empty a tank in 40 minutes. A second pipe with diameter twice as much that of the first is also attached with the tank to empty it. The two together can empty the tank i

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(#M40153921) BANK EXAM Numerical Ability question pipes and cistern Keep an EYE

A pipe can empty a tank in 40 minutes. A second pipe with diameter twice as much that of the first is also attached with the tank to empty it. The two together can empty the tank in

Asked In Bank Exam K.N.Mounika (8 years ago)

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Devendra Marghade  (8 years ago)

8 minutes

If first pipe that can empty a tank in 40 minutes has radius 'r', its 1 min. empty rate=1/40
As the second pipe has double the diameter than first will have radius=2r, so its flow will be directly proportional to cross sectional area=Pi*(2r)^2=4*Pi*r^2, which is 4 times the first pipe.
So the empty rate of second pipe=4/40=1/10
So together both pipes can empty the tank in 1/[(1/40)+(1/10)]=8 min.

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bhawna arora  (8 years ago)

1/20+1/40=3/40
so it will be emptied in 40/3 min.

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