SOLUTION: Two cars leave the origin; one goes north at 55 mph and the other goes south at 30 mph. After how many hours will they be 350 miles apart?

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Question 611232: Two cars leave the origin; one goes north at 55 mph and the other goes south at 30 mph. After how many hours will they be 350 miles apart?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Two cars leave the origin; one goes north at 55 mph and the other goes south at 30 mph. After how many hours will they be 350 miles apart?
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Going in opposite directions, the speeds are added.
55+30 = 85 mi/hr
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d = r*t
t = d/r