Question
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 :
Answer: Option D
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Total time taken = [160/64 + 160/8] hrs = 9/2 hrs.
∴ Average speed = [320*2/9] km/hr = 71.11 km/hr.
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