The sprinter's speed is 22.53 miles per hour.
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The sprinter runs 22.5 miles per hour. The sprinter covers 110 yards in 10 seconds. That's 110 yards per 10 seconds. (It's also 11 yards per second.) We need to convert the 110 yards/10 seconds into miles per (one) hour, or miles/hour. So let's do it. Here are the conversion factors: 1 mile = 1760 yards 1 minute = 60 seconds 1 hour = 60 minutes (11 yd/sec)(60 sec/min)(60 min/hr)(mile/1760 yd) = 11 x 60 x 60 x 1/1760 = 22.5 miles/hour
100 miles/50 seconds= 2 miles per second average speed
100 yards in 10 seconds 20.45 miles per hour.
15 miles in 60 minutes = 15 miles in 3600 minutes = 15 miles in 216000 seconds = 1 mile in 14400 seconds = 5280 feet in 14400 seconds = 63360 inches in 14400 seconds = 4.4 inches in one second = 88 inches in 20 seconds, or 7 feet-4 inches.
100 yards/6.7 seconds = 30.5292 miles per hour (rounded)