They will meet each character at B

First they met at 4km away from B \(\rightarrow\) it took 1h30m to go 'cause on level roads Kelly went at 8km/h and Kelly had gone 16 - 4 = 12 km and 12km : 8km/h = ​1.5h ​\(\rightarrow\) 90m.

Kerry also went the 4km left and it takes 30m too. So the time Kerry had spent was 1h30m - 30m = 1h and the length of B to C is: 10km/h x 1 = 10 (km) 

Then they are continuing to their respective destinations, Kerry go to A and turn around takes : 12km : 8km/h = 1.5h\(\rightarrow\) 90m. Kelly go to B takes: 4km : 8km/h = 0,5h \(\rightarrow\)30m, Kelly go to C takes: 10km : 5km/h = 2h. At that time Kerry has gone half way to B. Kelly turn around and go back, it take 1 hour for Kelly to go down = 10km : 10km/h = 1h. So Kerry will go to B right on Kelly go to B 'cause 8km : 8km/h = 1h