Question

A balloon is rising vertically above a level, straight road at a constant rate of 1...

A balloon is rising vertically above a level, straight road at a constant rate of 1 ft/sec. Just when the balloon is 69ft above the ground, a bicycle moving at a constant rate of 18ft ft/sec passes under it. How fast is the distance (t) between the bicycle and balloon increasing 3 seconds later?

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