Physics

The Olympic record for the marathon set in 2008 is 2 h, 6 m, 32 s. The marathon distance is 26 mi. What was the average speed of the record-setting runner in km/h?

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  1. d 26mi * 1.6km/mi = 41.6 km.

    t = 2h + (6/60)h + (32/3600)h.
    t = 2 + 0.1 + 0.00889 = 2.109h.

    Speed = d/t = 41.6km/2.109h = 19.73 km/h.

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