$[5$ pts$]$ Calculate the break$-$even round$-$trip travel distance $($in miles$)$ for siting a transfer station given the $2$ options below:

Option A: use $16-$ton capacity collection vehicles $($transportation cost $$\frac{13}{m}$ile $)$ to haul the waste to the landfill

Option B: use $38-$ton capacity tractor trailers $($transportation cost $$\frac{21}{m}$ile $)$ to haul the waste from a transfer station to a landfill; transfer station operating cost is $$\frac{10}{?}$ ton