19. The figure below shows Mark's, Cal's, and Lakecia's houses at the 3 vertices of the right triangle formed by 3 roads. The distances given in the figure are in miles. Mark and Lakecia each make a trip from Mark's house to Lakecia's house. Mark takes Grapevine Road. Lakecia takes Harbor Road to pick up Cal, and then takes Lott Road. How many miles shorter is Mark's trip than Lakecia's trip?