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Best Answer
1 mile = 1760 yards
1/1760 mile = 1 yard
100/1760 miles = 100 yards
1 hour = 3600 seconds
1/3600 hour = 1 second
9.21/3600 hours = 9.21seconds
speed = distance / time
= (100/1760 miles) / (9.21/3600 hours)
~= 22.21 mph.
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