At noon, ship A is 170 km west of ship B. Ship A is sailing east at 35 km/h and ship B is sailing north at 30 km/h. How fast is the distance between the ships changing at 4:00 PM?*** I already tried this problem 3-4 times. The answer is NOT 17.4 km/hour, 37.6 km/hour, or 20.6 km/hour. I followed this example: "At noon, ship A is 170 km west of ship B. Ship A is sailing east at 35 km/h and ship B is sailing north at 20 km/h. How fast is the distance between the ships changing at 4:00 PM?" but I was able to find the answer for the example problem.