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1. A pipe of diameter ‘d’ can drain a certain water tank in 40 minutes. The time taken by a pipe of diameter ‘2d’ for doing the same job is--
(A): 50 min.
(B): 10 min.
(C): 20 min.
(D): 80 min.
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By: anil on 05 May 2019 02.43 am
The pipe with diameter 2d will have four times the cross sectional area and hence will drain the tank four times faster.
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RRB 2009 Allahabad
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