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) 35.55 km/hr
B) 36 km/hr
C) 71.11 km/hr
D) 71 km/hr
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2×64×80÷64+80
=72.4
so ans is 72.4km/hr
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