***At noon, ship A is 170 km west of ship B. Ship A is sailing east at 35 km/h a

Question

***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.

Explanation / Answer

in four hours ship A travels a distance d= 35 km/h * 4hours = 140 km so at 4 pm ship A is 30 km from ship B previous position at 4 pm ship B is at the distance d2= 30 km/h * 4h= 120 km the distance between the ships is the hypothenues of a right triangle 30km by 120 km d(AB)= ?( 120

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