A child flies a kite at a height of 70 ft, the wind carrying the kite horizontally away from the child at a rate of 25 ft/sec. How fast must the child let out the string when the kite is 250 ft away from the child? . . . The child must let out the string at a rate of ft/sec when the kite is 250 ft away from the child. (Simplify your answer.)What are the dimensions of the lightest open-top right circular cylindrical can that will hold a volume of 3375 cm3? (I> The radius of the can is El cm and its height is D cm. (Type exact answers, using 11: as needed.)