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A balloon is rising vertically above a level, straight road at a constant rate of 1 ft/sec. Just when the balloon is 154 ft

A balloon is rising vertically above a level, straight road at a constant rate of 1 ft/sec. Just when the balloon is 154 ft above the ground, a bicycle moving at a constant rate of 20 ft/sec passes under it. How fast is the distance s(t) between the bicycle and balloon increasing 6 seconds later? y(t) s(t) 0 x(t)

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