



 
Hi Aaron, You have three fractions \[\frac{200 \mbox{ m}}{1 \mbox{ min}} \times \frac{60 \mbox{ min}}{ 1 \mbox{ hr}} \times \frac{1 \mbox{ km}}{1000 \mbox{ m}}.\] Since there are 60 minutes in an hour the middle fraction reduces to 1 with no units. The remaining numeric values reduce to $\large \frac15$ and the two units of metres cancel so you are left with \[\frac15 \frac{\mbox{ km}}{\mbox{ min.}}\] But the choices for answers have the units km/hr or m/hr. How do you convert km/min to km/hr or m/hr? Penny  


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