A tap having diameter 'd' can empty a tank in 84 min. How long another – McqOptions

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1.	A tap having diameter 'd' can empty a tank in 84 min. How long another tap having diameter '2d' take to empty the same tank?
A.	21 minutes
B.	42 minutes
C.	168 minutes
D.	28 minutes
Answer» B. 42 minutes

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