locations.

Min$30x_{13}+35x_{12}+12x_{23}+18x_{24}+39x_{26}+15x_{35}+12x_{45}+16x_{46}+30x_{56}$

$s.t.$

Node $1$ Flows

Node $2$ Flows

Node $3$ Flows $x_{13}+x_{23}-x_{35}=0$

Node $4$ Flows

Node $5$ Flows $x_{35}+x_{45}-x_{56}=0$

Node $6$ Flows

For all $x_{ij}=0,1.$

$(b)$ How long $(in$ minutes$)$ does $it$ take $to$ make a delivery from location $1to$ location $6?(Round$ your answer $to$ the nearest whole number.$)$

$$min

delivery time $if$ the package picked $upat$ location $1istobe$ delivered $to$ location $6?(Enter$ your answer $in$ standard time. Round your answer $to$ the nearest minute.$)$

$38$

$xp.m.$