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1. A truck driver must complete a 180-mile trip in 4 hours. If his average speed is 50 miles per hour for the first 3 hours, then how fast must he travel for the final hour ?
- A. 25
- B. 25
- C. 25
- D. 25
Answer: Option D
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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