SOLUTION: sarah drove for 7 hours at an average speed of 55 mi/h. for the first 3 hours, she drove 45 mi/h. what was her average speed for the last 4 hours?
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Question 447900: sarah drove for 7 hours at an average speed of 55 mi/h. for the first 3 hours, she drove 45 mi/h. what was her average speed for the last 4 hours?
Answer by rwm(914) (Show Source): You can put this solution on YOUR website!
7*55=3*45+4x
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