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| Math Central | Quandaries & Queries |
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Question from taylor, a student: two cars leave the park at the same time, one traveling north at a speed 10 mph faster than the other which is traveling south. after 3 hours the cars are 420 miles apart. find the speed of both cars |
Hi Taylor,
The important fact here is that rate equals distance divided by time.
Suppose that the car going south is travelling at $v$ miles per hour. How fast is the car going north travelling? At what rate is the distance between them changing? At that rate what is the distance between them in 3 hours? You know that the distance is 420 miles. Solve for $v.$
Penny
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