Practice problem
Math Artifacts
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The fastest recorded tennis serve was by Sam Groth, at 164 miles per hour. No matter where your opponent is standing, if you aim your serve at the farthest point from him, he will need to move at least 10 feet to properly reply. Your serve will travel about 60 feet.
An Olympic sprinter runs the 100 meter dash in about 10 seconds. What is the minimum serve speed that guarantees your opponent will not be able to dash those 10 feet, even if he is an Olympic sprinter?