Question 951871
In terms of just units:
[ ft/sec ] x [ mi/ft ] x [ sec/min ] x [ min/hr ] = mi/hr
If you do the cancellations, top and bottom, you 
are left with [ mi/hr ]
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Plugging in numbers:
{{{ 88*( 1/5280 )*( 60/1 )*( 60/1 ) = ( 88*3600 ) / 5280 }}}
{{{ ( 88*3600 ) / 5280 = 60 }}}
It's speed is 60 mi/hr