Xiao Gang and Xiao Qiang set out from ab Company at the same time. Xiao Gang rode his bike, and Xiao Qiang walked along the same route at a constant speed. Two hours after their departure, they met.

Xiaogang: 16km/h, Xiao Qiang 4km/h, Xiao Qiang 8 hours to reach point a.

It takes two hours to travel to Xiao Qiang, and it takes Xiao Gang half an hour to complete, which shows that Xiao Gang's speed is four times that of Xiao Gang, and two hours is six times more than that of Xiao Qiang, so the speed of Xiao Qiang =24/6=4.

The speed of Xiaogang is four times that of Xiao Qiang, so Xiaogang is 2 hours' journey and Xiao Qiang takes 8 hours.