None.
A second is a measure of time. A mile per hour is a measure of speed. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid without some addition information.
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4.7 metres per second is about 10.5 miles per hour.
44 yards in one second is the same as 90 miles in an hour.
80.0 (km per hour) = 0.0138082487 miles per second.
75 miles per hour = 110 feet per second
30 miles per hour = 13.4112 meters per second