Math

Amy and Ashley bike along the same trail. Amy bikes the entire trail at a speed of 20 mph and Ashley bikes it at a speed of 15 mph. Amy finishes biking the entire trail 8 minutes before Ashley. How many miles long is the bike trail?

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  1. speed=distance/time
    20=d/t
    20t=d
    t=d/20
    and
    15t=d
    d=15/t
    so amy finish
    15/t-20/t=8/20
    find t then you can get their distance

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  2. sorry it should be
    15/t-20/t=8/60

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  3. d/15 - d/20 = 8/60

    4 d - 3 d = 8

    d = 8
    =====================
    then Amy takes (8/20)*60 =24 min
    and Ashley takes (8/15)*60 =32min
    Indeed difference of 8 min

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  4. Collins, please check your answers.

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