A balloon and a bicycle. A balloon  is rising vertically above a level, straight road  at a
Channel: Doubtnut
Date: 2020-04-26

A balloon and a bicycle. A balloon  is rising vertically above a level, straight road  at a  constant rate of 1 ft/sec. Just when the balloon is 65 ft above the ground , a  bicycle moving at  a constant rate of 17 ft/sec passes under it . How fast is the distance between the bicycle and balloon increasing 3 sec later ?