At the 2010 Winter Olympics, in Vancouver, BC, Usain Bolt won the 100 meters, finishing in 9.69 seconds (a world record.) What was his speed in miles per hour, rounded to the nearest tenth? (1 meter is approximately 39.37 inches.) State the answer in decimal form, rounded to tenths.
speed= 100m/9.69sec*3600sec/hr*39.37in/m*1ft/12in*1mi/5280ft
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100 m/9.69 seconds in mi/hr