1 . On a trip of 200 miles, a man travels at the rate of 40 niles per hour for the first 100 miles. For the rest of the trip, he travels at the rate of 55 miles per hour. What is his average speed in miles per hour for the total trip?
- A. 400/9
- B. 200/9
- C. 90
- D. 50
- D. None of these
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