Use the Gantt chart and activity list to determine when resource $3$ is free.

$\backslash$table$[[$Activity$,$Resources,Activity,Resources$],[$R$,3,$M$,1],[$H$,1,$K$,5],[$G$,4,$J$,3],[$F$,2,$P$,1],[$B$,2,$S$,2],[$T$,4,$W$,3]]$

between $20$ and $30$

between $30$ and $40$

between $0$ and $10$

between $10$ and $20$