The volume of a spherical balloon being inflated changes at a constant rate. If initially its radius is 3 units and after 3 seconds it is 6 units. Find the radius of the balloon after t seconds.
Given:
Volume V 
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(constant)
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For t = 0, r = 3 and for t = 3, r = 6, So, we have,
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So after t seconds the radius of the balloon will be,
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Hence, radius of the balloon as a function of time is
1