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:
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Time taken to travel ist 160 km = Distance/speed = 160/64 hrs
Time taken to travel next 160 km = 160/80
Total time taken= 160/64 + 160/80 hrs = 9/2 hrs
Average speed = 320*2/9 = 71.11 km/hr
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