Party A and Party B depart from each other at the same time. Party A travels 120 km per hour and Party B 90 km per hour. What is the distance ratio between Party A and Party B when they meet

Party A and Party B depart from each other at the same time. Party A travels 120 km per hour and Party B 90 km per hour. What is the distance ratio between Party A and Party B when they meet

When we meet, we walk at the same time. The ratio of distance is equal to the ratio of speed
The speed ratio is 120:90 = 4:3
So the distance ratio is also 4:3

The speed of train a and B is 120km / h and 90km / h respectively, and the distance between city a and B is 73km / h
How many hours after they leave? I'm in a hurry

73 / (120 + 90) = 0.35 (hour)