Math Problem Solver

A boy 5 ft tall is walking away from a street light at the rate

of 3 ft/sec. If the light is 12 ft above the level ground, deter-

mine (a) the rate at which his shadow is lengthening, (b) the

rate at which the tip of his shadow is moving and (c) the rate

at which his head is receding from the light when he is 24

ft from the point directly below the light.