A motorist travels 400 km at 80 km/h and 400 km at 100 km/h. What is the average speed of the motorist on
this trip?
(A) 84 km/h (B) 89 km/h (C) 90 km/h (D) 91 km/h (E) 95 km/h
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Answer:
answer is (B).
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Answer : (B)
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