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One car moving in a straight …

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One car moving in a straight covers one third of the distance with 20km/hr and the rest with 60km/hr . What is the average speed?

    • Posted by Jay Singh 7 years, 1 month ago

    CBSE > Class 11 > Physics
    • 1 answers

    Karamjeet Singh 7 years, 1 month ago

    Let the total distance be S Then speed for S/3 distance =20km/hr Time taken (t)=S/3×20 = S/60 Remaining dist =S-S/3 =2S/3 Time taken = 2S/3×60 =S/90 Avrge speed=total dist. /total time =S/S/60 +S/90 =S/3S+2S/180 =180S/5S =36km/hr

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