denise has 3 hours to spend training for an upcoming race. she completes her training by running full speed the distance of the race and walking back the same distance to cool down. If she runs at a speed of 8 mph and walks back at a speed of 4 mph, how long should she plan to spend walking back?

Question

denise has 3 hours to spend training for an upcoming race.  she completes her training by running full speed the distance of the race and walking back the same distance to cool down.  If she runs at a speed of 8 mph and walks back at a speed of 4 mph, how long should she plan to spend walking back?

anonymous · Answer

2 hours

anonymous · Answer

total distance = 8mph*time1+4mph*time2
total time = time1 + time2 = 3hrs