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March 29, 2017

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How would you set up problem: your average rate traveling uphill was 2.2 kilometers per hour and average rate downhill was 3.3 kilometers per hour. If he spent a total of 12 hours hiking, how long was the trail?

  • Algebra - ,

    length of trail ---- x km

    time to go uphill = x/2.2
    time to go downhill = x/3.3

    x/2.2 + x/3.3 = 12
    times 6.6
    3x + 2x = 79.2
    5x = 79.x = 15.84 km

    the trail was 15.84 km long

    check:
    time uphill = 15.84/2.2 = 7.2 hrs
    time downhill = 15.84/3.3 = 4.8 hrs

    7.2 hrs + 4.8 hrs = 12 hrs
    All is good!

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