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?

Answer 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.