Taking into account that:
[tex]\boldsymbol{\sf{Therefore \ \ \longmapsto \ \ \ 60\dfrac{\not{ft}}{\not{s}}*\left(\dfrac{1 \ mi}{5280\not{ft}}\right)*\left(\dfrac{3600 \not{s}}{1 \ h}\right)=\boxed{\boldsymbol{\sf{ 40.9091 \ Mi/hr }}} }}[/tex]
So 60 Feet/Sec = 40.9091 Miles/hours.