On a clear day, Hyun-woo and Su-hyeon set out to meet each other. Hyun-woo rode his bicycle at a speed of 6 km/h, and at the same time, Su-hyeon rode her bicycle at a speed of 4 km/h. Calculate the time it takes for Hyun-woo and Su-hyeon to meet.
Creator Comment
I made this in a rush, so please don't play it (?)