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19 October, 20:11

During first half of the journey a body travels with speed of 40km/hrs and in next half it travels with speed of 20km/hrs. Calculate the average speed of the whole journey

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  1. 19 October, 21:25
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    It covers a distance of 80 km

    in first half it takes 1 hr to cover 40 km at speed of 40 kmph

    in second half it takes 2hr to complete 40 km at speed of 20kmph

    so average speed is 80/3 kmph
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