A man on tour travel first 160km at 64km/hr and next 160km at 80km/hr the elaverege speed for the first 320km of the tour is
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Average speed=2ab/a+b, where 'a' and 'b' are the speeds in the first and second half respectively. Applying this formula to the above question, we get average speed as, 2×64×80/64+80. Solving this we get 10240/144, that is, approx 71.11 km/hr
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