The student to teacher ratio is 19: 1 at school and there is a total of 400 students and teachers. how many teachers and how many students are there?

David and alton are training for a race. they spend 35 minutes stretching and then go on a 5 mile practice run. david runs at a pace of 7 min/mile. alton runs at a pace of 8 min/mile. write an equation for each runner that shows the total length of their workout. then solve each equation showing your work