Each morning, Kathie rides the train 9 km to work. The train takes 10 minutes to travel 4 km. How much time does Kathie spend on the train each day going to and from work?
This is because half of 9 is 4 1/2, if she has to go 9 km, that would take her 20 minutes, now add in the time it takes her to go back at the same speed.
