A man on tour travels first 160 km at 64 km/he and the next 160 km at 80 km/hr. The average speed for the first 320 km of the tour is?

 A man on tour travels first 160 km at 64 km/he 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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