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20 August, 16:05

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

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  1. 20 August, 16:10
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    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

    5x=40

    x=8 km
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