Three routes connect an origin and destination with performance functions: t$1=2+0\mathrm{.}5$x$1$; t$2=1+$x$2$; t$3=4+0\mathrm{.}2$x$3($with t$$s in minutes and x$$s in thousands of vehicles per hour$).$ Determine user equilibrium flows if the total origin to destination demand is $10,000$ veh$/$h$.$ Select the correct answer from the following options: