Brock is a plumber. he charges a flat rate of $40 to visit a house to inspect it's plumbing. he charges an additional $20 for every hour he spends inspecting or making repairs. which graph correctly shows the price of using brock's plumbing service vs time?

Every weekday, mr. jones bikes from his home to his job. sometimes he rides along two roads, the long route that is shown by the solid lines. other times, he takes the shortcut shown by the dashed line. how many fewer kilometers does mr. jones bike when he takes the shortcut instead of the long route?