A spherical balloon is filled with

Question:

A spherical balloon is filled with $4500 \pi$ cubic meters of helium gas. If a leak in the balloon causes the gas to escape at the rate of $72 \pi$ 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. $9 / 2$

  2. $9 / 7$

  3. $7 / 9$

  4. $2 / 9$


Correct Option: , 4

Solution:

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