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A spherical balloon is filled with 4500p...

A spherical balloon is filled with 4500p cubic meters of helium gas. If a leak in the balloon causes the gas to escape at the rate of `72pi` cubic meters per minute, then the rate (in meters per minute) at which the radius of the balloon decreases 49 minutes after the leakage began is (1) `9/7` (2) `7/9` (3) `2/9` (4) `9/2`

A

`(9)/(7)`

B

`(7)/(9)`

C

`(2)/(9)`

D

`(9)/(2)`.

Text Solution

Verified by Experts

The correct Answer is:
C
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