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Two buses leave Houston at the same time and travel in opposite directions. One bus averages 55 mi/h and the other bus averages 45mi/h. When will they be 400 miles apart?
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Two buses leave Houston at the same time and travel in opposite directions. One bus averages 55 mi/h and the other bus averages 45mi/h. When will they be 400 miles apart?

User Spozun
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Add them up and you get that they get an added 100 miles away every hour. Divide that by 400 and you get that they are 400 miles away after 4 hours.
User Aaron Queenan
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