1. One car leaves a given point and travels north at 30 mph. Another car leaves 1 HOUR LATER, and travels west at 40 mph. At what rate is the distance between the cars changing at the instant the second car has been traveling for 2 hours? 2. A 130ft ladder is placed against a large building. The base of the ladder is resting on an oil spill, and it slips at the rate of 10 ft. per minute. Find the rate of change of the height of the top of the ladder above the ground at the instant when the base of the ladder is 50 ft. from the base of the building