story problem

Question

Two trains leave the station at the same time, one heading east and the other west. The eastbound train travels at 80 miles per hour. The westbound train travels at 90 miles per hour. How long will it take for the two trains to be 204 miles apart?

Answer 1

d = r · t

East: d = 80t

West: d = 90t

 

East + West = 204

80t + 90t = 204

170t = 204

t ≈ 1.2

 

They are 204 miles apart after one hour twelve minutes.