Solve the problem.A truck driver started for his destination at an average speed of 80 miles per hour. Once snow began to fall, he had to drop his speed to 30 miles per hour. It took the driver 10 hours to reach his destination, which was 500 miles away. How many hours after the driver started did the snow begin to fall?
A. after 6.2 hr
B. after 3.8 hr
C. after 4.0 hr
D. after 6.0 hr
Answer: C
Mathematics
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