A 6 ft tall person walks directly away from a 15 ft streetlight at 4 ft/s

MATHEMATICS · Subjective · A Level · Mathematics · Differentiation · Differentiation

Problem

A 6 ft tall person walks directly away from a 15 ft streetlight at 4 ft/s. Determine the rate at which the tip of the person’s shadow moves along the ground when the person is 10 ft from the base of the streetlight. Give your answer in ft/s.

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