<PRE><B>Question 743218</B>
Teri drove an average of 52 miles per hour on a 5-hour trip. During the first 3 hours, she drove 60 miles per hour. What was her average speed for the last 2 hours of the trip?
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Total distance: 5*52 = 260 miles
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1st 3 hrs: 3*60 = 180 miles
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Last 2 hrs: (260-180)/2 = 40 mph
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cheers,
Stan H.
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