At the 2008 Olympics the Ethiopian runner Kenisa Bekele won the 1.00 × 10⁴ meter run in 27 minutes, 1.17 seconds. What is this speed in miles per hour? [1 mile = 1.609 km]

Question

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1.00 × 10⁴ meters is equivalent to 10,000 meters. 27 minutes and 1.17 seconds is equivalent to 1621.17 seconds. So, the speed in meters per second is: Speed = Distance/Time Speed = 10000/1621.17 Speed ≈ 6.17 m/s Now we need to convert m/s to mph: 1 mile = 1609 meters (from 1 mile = 1.609 km) So, 1 meter/second = 2.237 miles/hour Therefore, the speed in miles per hour is: Speed ≈ 6.17 m/s × 2.237 miles/hour/meter Speed ≈ 13.8 mph Thus, the answer is choice D) 13.8 mph.

At the 2008 Olympics the Ethiopian Runner Kenisa Bekele Won