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1. A truck driver must complete a 180-mile trip in 4 hours. If he averages 50 miles an hour for the first three hours of his trip, how fast must he travel in the final hour?
- A. 30 mph
- B. 30 mph
- C. 30 mph
- D. 30 mph
Answer: Option A
Explanation:
d = s x t
= 50 x 3
= 150
now distance left
= 180 - 150
= 30
thus he need s to travel 30 miles in 4th hour thus his speed should be 30 miles per hour
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