Question

Two trucks leave the truck stop at the same time, one heading north and one heading south. The truck driving south is driving 15 miles per hour slower than the truck driving north. How fast is the slower truck traveling is they are 1,250 miles apart after 10 hours worth of driving?
they are separating at the rate of 125 mph

s + s + 15 = 125 ... 2 s = 110
85 mile per hour
Two cars leave St. Louis at the same time and travel south on the same interstate. One car travels at a constant speed of 58 miles per hour and the other travels at a constant speed of 63 miles per hour. In how many hours will the cars be 40 miles apart?

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