Anew obstacle course is home to several new types of challenging obstacles. one such obstacle is traversing a 15-stair staircase. to make it more challenging, the stairs are not uniformly spaced. rather, the vertical space between consecutive stairs for the first 10 stairs is 1 1/3 feet and the vertical space for the last 5 stairs is 1 3/4 feet. what is the total vertical distance traveled ascending and descending the entire 15-stair staircase?