A tap having a diameter(d) can empty a tank in 84 min. How long another tap having diameter 2d take to empty the same tank?

A tap having a diameter(d) can empty a tank in 84 min. How long anothe

1.	A tap having a diameter(d) can empty a tank in 84 min. How long another tap having diameter 2d take to empty the same tank?
A.	21 mins
B.	25 mins
C.	27 mins
D.	36 mins
Answer» B. 25 mins

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A tap having a diameter(d) can empty a tank in 84 min. How long another tap having diameter 2d take to empty the same tank?

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