Math CentralQuandaries & Queries


Question from Caroline, a parent:

Two cars pass each other going i opposite directions. One car is going 100 km/h and the other is going 80 km/h. How far apart will the two cars be after driving 45 minutes at these rates of speed?

Hi Caroline,

After they pass each other at what rate is the distance between them changing? At that rate how far apart will they be in 45 minutes (3/4 of an hour)?


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