The record for a marathon is 4 h, 36 min, 21 s. The marathon distance is 90.25 km. Determine the average speed in m/s of a runner achieving this record.

Answer 1

t = 4h,36min,21s. = 4h,36.35min=4.61h.

r = d/t = 90.25km / 4.61h = 148.97 km/h.