A truck driver drove 60 km/h for three hours. Then he stopped for one hour and did not go anywhere. Then, he drove four more hours at 60 km/h. What was the driver's average speed (in km/h)?
A.62.4
B.52.5✓ Correct
C.50.5
D.42.8
Explanation
Total distance = 60×7 = 420 km, total time = 8 hours (including 1 hour stop). Average speed = 420/8 = 52.5 km/h.
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