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1. A man can cross 10 miles distance of a river in favor of the stream in 2 hours. He can come back against the stream along the same way in 5 hours. What is the average speed, in miles per hour, for the entire trip?
- A. 20/7
- B. 20/7
- C. 20/7
- D. 20/7
Answer: Option A
Explanation:
Total distance = 10 + 10 = 20 miles
Total time required = 5 + 2 = 7 hours
Average speed = 20/7 miles per hour
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