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 C
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Total time taken = `(160/64 + 160/8)` hrs. = `9/2` hrs.
`:.` Average speed = `(320 xx 2/9)`km/hr = 71.11 km/hr.
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