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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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Correct Answer : C.


Total time taken = 16064 + 16080 hrs. = 92 hrs. 
∴ Average speed = 320 x 29 km/hr = 71.11 km/hr. 

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