1.) Two cars start moving from the same point. One travels south at 24 mi/h and the other travels west at 18 mi/h. At what rate is the distance between the cars increasing two hours later? 2.)A man starts walking north at 3 ft/s from a point P. Five minutes later a woman starts walking south at 6 ft/s from a point 500 ft due east of P. At what rate are the people moving apart 15 min after the woman starts walking? (Round your answer to two decimal places.)

3.) At noon, ship A is 60 km west of ship B. Ship A is sailing south at 15 km/h and ship B is sailing north at 5 km/h. How fast is the distance between the ships changing at 4:00 PM? (Round your answer to one decimal place.)