5.5. The distance between two cars driving on a highway is 200 km. The speeds of the cars are 60 km/h and 80 km/h. What will be the distance between them after 1 hour?
Solution. There are four possible cases (a diagram should be made):

1) The cars are driving towards each other: $200-(60+80)=60$ km;
2) The cars are driving in opposite directions: $200+(60+80)=340$ km;
3) The cars are driving in the same direction, with the second car catching up to the first: $200+(60-80)=180$ km;
4) The cars are driving in the same direction, with the second car ahead: $200+(80-60)=220$ km.

Answer. There are four possible cases: $60,180,220$ and 340 km.