SOLUTION: The Browns are moving across the country. Mr. Brown leaves 4.5 hours before Mrs. Brown. If he averages 70mph and she averages 80mph, how many hours will it take Mrs. Brown to cat

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Question 1181111: The Browns are moving across the country. Mr. Brown leaves 4.5 hours before Mrs. Brown. If he averages 70mph and she averages 80mph, how many hours will it take Mrs. Brown to catch up to Mr. Brown?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
Mr. Brown has traveled 70%28miles%2Fhour%29%2A4.5%28hours%29=315%2Amiles, when Mrs. Brown begins traveling.

Her approach rate to Mr. Brown is 10 miles per hour. If she will need x hours to catch up, then 10%2Ax=315 and you can solve.