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A balloon leaves the ground 50 ft from a...

A balloon leaves the ground 50 ft from an obsever, If it rises vertically at the rate of 6 ft/s, how fast it receding from the point of obsevation when it is 120 ft above the ground?

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The correct Answer is:
`(72)/(13)`ft/s
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CHHAYA PUBLICATION-SIGNIFICANCE OF DERIVATIVE AS RATE OF CHANGE-LONG ANSWER TYPE QUESTIONS
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