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Charlie runs at a speed of 3 yards per second. About how many miles per hour does Charlie run?

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bobeld
3yds per second is 60 x 3 = 180 yds per minute  x 60 = 10800 yds in an hour.  Since there are 1760 yards in a mile we can divide 10800/1760  and we get 6.136363... or about 6 miles per hour.