A street light is at the top of a 16.0 ft. tall pole. A man 5.9 ft tall walks away from the pole with a speed of 5.5 feet/sec along a straight path. How fast is the tip of his shadow moving when he is 47 feet from the pole?

Answer 1

look at Steve's solution here
http://www.jiskha.com/display.cgi?id=1382123644

then change the numbers to fit your problem