At the 2008 Olympics, the Jamaican runner Usain Bolt ran the 100-meter dash in world record time of 9.69 seconds. What is this speed in miles per hour? [1 mile = 1.609 km]

Question

Quizplus · Accepted Answer

- Convert 100 meters to miles: 100 meters * 0.000621371 = 0.0621371 miles 
- Convert Bolt's time in seconds to hours: 9.69 seconds * 0.000277778 = 0.00269121 hours 
- Divide the distance by the time: 0.0621371 miles / 0.00269121 hours = 23.1 mph

At the 2008 Olympics, the Jamaican Runner Usain Bolt Ran