Math Word Problem

At the 1988 Summer Olympics in
Seoul, South Korea, Florence Griffith-Joyner ran the
100-meter dash in 10.49 seconds (a world record). What
was her speed in miles per hour? (1 meter is approximately
39.37 inches.)

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  1. 1 inch = 2.54 cm exactly
    So 1 mile/h
    = 1760 yds * 3 ft * 12 in. * 0.0254 m / 3600 s.
    = 0.44704 m/s
    so
    100m/10.49s
    =(100/10.49)/0.44704 mph
    = ? mph

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    posted by MathMate
  2. 21.32 mph

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