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30 July, 09:58

Fiora starts riding her bike at 18 mi/h. After a while, she slows down to 12 mi/h, and maintains that speed for the rest of the trip. The whole trip of 69 miles takes her 4.5 hours. For how long did she travel at 18 mi/h?

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  1. 30 July, 10:12
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    t = 2.5 hours

    Explanation:

    given,

    speed of the bike for t time = 18 mi/h

    final speed of the bike after t time = 12 mi/h

    total distance, D = 69 miles

    total time, T = 4.5 hour

    time for which speed of the bike is 18 mi/h = ?

    we know distance = speed x time

    now,

    18 x t + 12 (4.5 - t) = 69

    6 t + 54 = 69

    6 t = 15

    t = 2.5 hours

    The bike was at the speed of 18 mi/h for 2.5 hours.
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