How many hours will Andrea be walking?

Question

Andrea has 6 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 7 mph and walks back at 3 mph, how long should she plan to spend walking back?

Answer 1

Let R = time running and W = time walking

 

R + W = 6

 

7R = 3W

 

R = 6 - W

 

7(6 - W) = 3W

 

42 - 7W = 3W

 

42 = 10W

 

W = 4.2

R = 1.8

 

You should check that these values match the specifications in the problem.