Air is being pumped into a spherical balloon at the rate of 30 `cm^(3)//s`. Then the rate (in `cm//s`) at which the radius increases when it reaches the value 15 cm , is-

Gas is being pumped into a a spherical balloon at the rate of 30 ft^(3)//min . Then the rate at which the radius increases when it reaches the value 15 ft, is

Gas is being pumped into a a spherical balloon at the rate of 30 ft^(3)//min . Then the rate at which the radius increases when it reaches the value 15 ft, is

Gas is being pumped into a a spherical balloon at the rate of 30 ft^(3)//min . Then the rate at which the radius increases when it reaches the value 15 ft, is

Gas is being pumped into a spherical balloon at the rate of 30 (ft)^(3)/min . Then the rate at which the radius increases when it reaches the value 15ft is

Gas is being pumped into a spherical balloon at the rate of 30 ft^(3) min^(-1) . Then the rate at which the radius increases when it reaches the value 15 ft, is

Gas is being pumped into a spherical balloon the rate of 30ft^(3)//min . Then the rate at which the radius increases when it reaches the value 15 ft is a) (1)/(15pi)ftmin b) (1)/(30pi)ft//min c) (1)/(20)ft//min d) (1)/(25)ft//min