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A spherical balloon is filled with 4500p...

A spherical balloon is filled with `4500pi` cubic metres of helium gas. If a leak in the balloon causes the gas to escape at the rate of `72pi` cubic metres per minute, the rate (in metres per minute) at which the radius of the ballon decreases 49 minutes after the leakage began is-

A

`(2)/(9)`

B

`(9)/(2)`

C

`(9)/(7)`

D

`(7)/(9)`

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