A and B started towards each other at the same time from two different places which is 123 km apart and met in 4 hours after they started. If the speed of A was 12 km/h, then what is the speed of B (in km/h)?
1
18.25 km/h
2
18.75 km/h
3
16.50 km/h
4
16.75 km/h