A light is hung 15 ft above a straight horizontal path. If a man 6ft tall is walking away from the light at the rate of 5ft/s a. How fast is the

A light is hung 15 ft above a straight horizontal path. If a man 6ft tall is walking away from the light at the rate of 5ft/sa. How fast is the shadow lengthening?b. What is the rate of the tip of the man's shadow moving?This is a reviewer. I hope you could help me solve this problem.