Usain Bolt Holds the World Record for the 100 M

Multiple Choice

Usain Bolt holds the world record for the 100 m dash at 9.58 s. What was his average speed in miles/hour for this distance? The equivalence statements are 1 km = 0.621 mi and 3,600 s = 1 hr. It is interesting to compare this value with the average speed for walking (3 mph) , bicycling (12 mph) , and horse racing (38 mph) .

A) 23.3 mi/hr
B) 46.6 mi/hr
C) 11.7 mi/hr
D) 18.7 mi/hr
E) 26.7 mi/hr