Two men start a bicycle race at triangular track ABC.

Starting from the point A simultaneously, one of them traverse the track in clockwise sense A-> B -> C & the other in anticlockwise sense A-> C-> B with their respective constant speed. After 4 min from the start, they first meet at B and then continue the race.

After what minimum time they meet first at B, will they again meet at B? Distance AB=500m, BC=400m, CA=300m