Item 16 there are a total of 68 students in the robotics club and the science club. the science club has 10 more students than the robotics club. how many students are in the science club

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?