SOLUTION: The Smiths are moving across the state. Mr. Smith leaves 3.5 hours before Mrs. Smith. If he averages 40 mph and she averages 60 mph, how long will Mrs. Smith have to drive before

Question 581710: The Smiths are moving across the state. Mr. Smith leaves 3.5 hours before Mrs. Smith. If he averages 40 mph and she averages 60 mph, how long will Mrs. Smith have to drive before she overtakes Mr. Smith?
I need a Let statement, an equation and a conclusion and I have to show all my work.
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
Mr. Smith has a 140 mi head start (3.5 * 40)

Mrs. Smith catches up at the rate of 20 mph (60 - 40)

it will take her 7 hr to catch up (140 / 20)
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