Question

Dana 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 10 mph and walks back at a speed of 2 mph, how long should she plan to spend walking back?

Answer 1

Dana should plan to spend 2 1/2 hours walking back because for every hour she spends running she spends 5 more hours walking. That's a ratio of 5 to 6 because she spends 5 hours walking in 6 hours spent training. 5/6 of 3 hours is 2 1/2 hours.