A tap having diameter 'd' empty a tank in 40 min. How long another tap having diameter '2d' take to empty the same tank?

A tap having diameter 'd' empty a tank in 40 min. How long another tap

1.	A tap having diameter 'd' empty a tank in 40 min. How long another tap having diameter '2d' take to empty the same tank?
A.	5 min
B.	20 min
C.	10 min
D.	80 min
Answer» C. 10 min

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A tap having diameter 'd' empty a tank in 40 min. How long another tap having diameter '2d' take to empty the same tank?

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