Question 155510
r*t=d __ so t=d/r __ 2hr15min is 9/4 hr


"Elisa walked a certain distance at 5 mi/h" __ Tw=d/5


"jogged twice that distance at 8 mi/h" __ Tj=2d/8=d/4


the total time is Tw+Tj __ the total distance is 3d


d/5+d/4=9/4 __ multiplying by 20 __ 4d+5d=45 __ 9d=45 __ d=5 __ 3d=15