6. A motorist travels for 3 hours at 40 miles per hour and then covers a distance of 80 miles in 2 hours and 40 minutes. His average rate for the entire trip was: (A) 35.3 m.p.h. (B) 36 m.p.h. ✓ 13. 37 m.p.h. (D) 35.5 m.p.h. ​

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