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Susan travels by car at an average speed of 50 miles per hour for 4 hours and th...
Question 3
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Susan travels by car at an average speed of 50 miles per hour for 4 hours and then at an average speed of 20 miles per hour for 2 hours. What is her average speed, in miles per hour, for the entire 6-hour trip?
A.25
B.30
C.35
D.40
E.45
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