Need help with all three questions shown!

What is the length of the unknown leg in the right triangle ?

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?

Shannon drove for 540 minutes. if she traveled 65 miles per hour,how many total miles did she travel?