a jogger ran 4 miles, decreased her speed by 1 mile per hour, and then ran another 5 miles. If her total jogging time was 2 1/20 hours, find her speed for each part of her run.
Let the speed of the joker initially be x mi/hr after reduction, the new speed will be: (x-1) mi/hr but time=(distance)/(speed) hence : Total time taken will be: 4/x+5/(x+1)=41/20 solving for x we get: x=21.585 mi/hr thus the initial speed was 21.585 mi/hr after reduction the new speed was 20.585 mi/hr
