You cannot. A foot is a linear measure of displacement whereas a radian measures angular displacement. The two measure different characteristics and conversion between the two is not valid.
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miles per hour x 88 = feet per minute
1 rotation/1 min * 1 min/60s * (2*Pi radian/1 rotation)
The radian is 0.523598776
1 degree = pi*radian/180 So therefore 15 times pi*radian/180 = pi*radian/12
A radian is an arc of the circumference of a circle and it is about 57.3 degrees.