Wes and Tony live 360 km apart. If Wes travels at 80 km/h towards Tony. And Tony travels at 100 km/h towards Wes, how long will it take before they meet.

Thiru
Middle(6-9)
Teacher

Thiru,

Wes and Tony are initially 360 km apart then they start to move toward each other. How fast is the distance between them shrinking? At that rate how long does it take the distance between them to shrink from 360 km to 0 km?