keeping in mind there are 1.609 kilometers in 1 mile, and 1000 meters in 1 kilometer, and 60 minutes in an hour and 60 seconds in a minute, therefore 60*60 seconds in an hour, or 3600 seconds, then
[tex]\bf \cfrac{248~\underline{mile}}{\underline{hr}}\cdot \cfrac{1.609~\underline{km}}{\underline{mile}}\cdot \cfrac{1000~m}{\underline{km}}\cdot \cfrac{\underline{hr}}{3600~sec}\implies \cfrac{248\cdot 1.609\cdot 1000~m}{3600~sec}
\\\\\\
\cfrac{399032~m}{3600~sec}\approx 110.84\frac{m}{sec}[/tex]
