On a 400 mile trip ,car X traveled half the distance at 40 miles per hour and the other half at 50 miles per hour .What was the average speed of car X?
A. 45
B. 44 4/9
C. 40
D. 45 4/9
সঠিক উত্তরঃ
B.
44 4/9
Explanation:
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