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The time it takes Javier to go to school and his walking rate are inversely proportional. If it takes him 12 mins walking at 3 mph how long does it take if he walks at 4 mph?

  • Math -

    t = k/r

    12 = k/3
    k = 36

    t = 36/r

    when r=4,

    t=36/4 = 9 min

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