A hiker begins his hike 52 feet below sea level. By the end of the day he is 427 feet above sea level what is the difference in elevations?

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?