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A car travelling at 90km/h is 500m behind another car travelling at 70km/h in the same direction. How long will it take the first car to catch the second?

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  1. 3 June, 12:47
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    Relative speed: 90 - 70 = 20 km/h

    s = d : t

    t = d : s

    t = 500 m : 20 km/h x 1000 m/h x 1 : 60 hr/mins

    t = 1.5 minutes.
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