At noon, ship A is 150 km west of ship B. Ship A is sailing east at 20 km/h and ship B is sailing north at 25 km/h. After two hours, they are approximately 121 km apart. How fast is the distance between the ships changing after two hours?
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We can use Pythagoras:
After two hours, A has traveled 40 km and B has traveled 50 km.
Therefore, At two hours the distance between them is:
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