A man on tour travels first 160 km at 64 km/hr and the next 160 km at 80 km/hr. The average speed for the first 320 km of the tour is:
A. 75.2
B. 71.1
C. 70
D. 75
E. 80
সঠিক উত্তরঃ
B.
71.1
Explanation:
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