A stone is dropped in quiet lake and waves move in circles a

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A stone is dropped in quiet lake and waves move in circles at the speed of 5 cms^-1. At the instant when the radius of the circular wave is 8 cm, how fast is the enclosed area increasing?

[DSSSB TGT 2014 (Mathematics)]

A 40 cm2 s-1

B 80 cm2 s-1

C 60 cm2 s-1

D None of these