It takes a runner 2 h, 43 min, 57 s to run a marathon. If the distance of a marathon is 42.2 km, what is the average speed of the runner?

Answer 1

speed(km/hr) = distance(km)/time(hr)
So, (42.2km)/(2h43'57")
= 42.2/2.733 km/hr
= 15.44 km/hr