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

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Question 639172: Two buses leave Houston at the same time and travel in opposite directions. One bus averages 55 mph. and the other bus 45 mph. When will they be 400 miles apart?
Answer by Edwin McCravy(20054) About Me  (Show Source):
You can put this solution on YOUR website!
Their rate of separation is 55+45 = 100mph, so they'll be 400
miles apart in 4 hours.