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14 November, 11:34

If the trip takes 3 hours for a total distance of 350 km, travelling at x hours at 120km/h and remaining time at 60 km/h

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  1. 14 November, 13:20
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    x = 2.8 hours

    Explanation

    Total distance = 350 km

    Time period = 3 hrs

    Hence we need to formulate an equation ...,

    Distance = Speed * Time

    ; Distance covered travelling at 120 = 120x Since the total time period was 3hrs ... then the remaining time is (3 - x)

    ; Distance covered travelling at 60 = 60 (3 - x)

    The equation is going to be ...,

    ; 120x + 60 (3 - x) = 350 ... since total distance is 350 km

    ; 120x + 180 - 60x = 350

    ; 60x = 170 ... divide both sides by 60

    Hence ..., x = 2.8 hours
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