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18 February, 09:20

Alexandra and Karissa are 261 miles apart, traveling towards each other. If Karissa travels 17 mph and Alexandra travels 12 mph how long until they meet?

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  1. 18 February, 10:59
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    Karissa - >. Distance = speed x time

    Take the distance she travels to be x

    X = 17t

    Alexandra - > she would meet karissa at 261 - the x miles karissa travelled hence we get the equation

    (261 - x) = 12t

    Rearrange so x is the subject

    X = 261 - 12t

    Next set the two equations equal to each other so you get

    17t = 261 - 12t

    Now solve for t

    29t = 261

    Divide each side by 29 To get the Value of t

    t = 9 hours (remember to take the units into account)
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