Helium is pumped into a spherical balloon at a constant rate of 2 cubic feet per second. How fast is the radius increasing after 3 minutes? At what time (if any) is the radius increasing at a rate of 140 feet per second? The radius is increasing at a rate of 0.0082 ft/sec. (Type an integer or a decimal. Do not round until the final answer. Then round to four decimal places as needed.) Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. The time at which the radius increases at a rate of 140 feet per second is sec. (Type an integer or a decimal. Do not round until the final answer. Then round to five decimal places as needed.) B. There is no solution