Time and Distance Q.13

0. A man on tour travels first 320 km at 64 kmph and the rest at 80 kmph. The average speed for the entire 640 km of the tour is

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Option : C
Explanation : As the distance in both ways is same, we can apply the formula 2xy/x + y.
Average speed = (2 × 64 × 80)/(64 + 80) = 71.11 kmph

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