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22 December, 07:12

A cyclist rode the 1st 20 mile portion of his workout, at a constant speed. For the 12 mile cool down portion of his workout, he reduced his speed by 4 miles per hour. Each portion of the workout took the same time. Find the cyclist speed during the first portion, and find his speed during the cool down portion

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  1. 22 December, 09:49
    0
    10 mph

    Explanation:

    20 / x = 12 / (x - 4)

    Cross multiply

    12x = 20 (x - 4)

    12x = 20x - 80

    80 = 20x - 12x

    80 = 8x

    divide through by '8'

    10 = x

    x = 10 mph
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Home » Engineering » A cyclist rode the 1st 20 mile portion of his workout, at a constant speed. For the 12 mile cool down portion of his workout, he reduced his speed by 4 miles per hour. Each portion of the workout took the same time.
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