A streetlight is on a pole 15 ft tall. A boy 5 ft tall walks away from the pole at a rate of 5 ft/sec. At what rate is his shadow lengthening when he is 25 ft from the pole?

Question

A streetlight is on a pole 15 ft tall. A boy 5 ft tall walks away from the pole at a rate of 5 ft/sec. At what rate is his shadow lengthening when he is 25 ft from the pole?

At what rate (in feet per second) is the tip of his shadow moving?

Answer 1