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A car completes a journey in 10 minutes. For the first of the distance the speed was 60 km/h and for the second half the speed was 40 km/h. how far is the journey?

  • math -

    Let the total distance be x.
    (x/2)/60 + (x/2)/40 = (10minutes)/(60minutes/hour)
    x/120+x/80 = 1/6
    multiply by common denominator 240
    2x+3x = 40
    x=8 km

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