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A man has a bicycle and a balloon. He lets go of the balloon, and starts...

A man has a bicycle and a balloon. He lets go of the balloon, and starts to ride his bicycle along a level road. The balloon is rising at a rate of 4 ft per second, and he his riding his bike at a rate of 3 ft/ sec. How fast is the distance between the man and the balloon changing, when the balloon has risen 8 feet, and he had ridden 6 feet?

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