A street light is at the top of a 15 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 7 ft/sec along a straight path.

A street light is at the top of a 15 ft tall pole. A woman 6 ft tall walks away from the pole with a speed of 7 ft/sec along a straight path. How fast is the tip of her shadow moving when she is 50 ft from the base of the pole?