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
Drill 1
Question: 4
Page: 521
Therefore Total distance = 240 miles.
Av speed for the entire trip = 240/6 = 40 miles per hour (Since total time = 6 hrs)
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