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A cistern is being emptied in such a way...

A cistern is being emptied in such a way that the rate at which water is flowing out is proportional to the amount left at that instant. If half the amount flow in 7 minutes, after how much time 1/8 th of the water will be left? a)14 minutes b)21 minutes c)28minutes d)35 minutes

A

14 minutes

B

21 minutes

C

28minutes

D

35 minutes

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