设中途下车x人,终点下车的人数是(50-x)人,由题意得:0.6x+(50-x)×0.9=36.9, 0.6x+45-0.9x=36.9, 45-0.3x=36.9, 45-0.3x+0.3x=36.9+0.3x, x=27;终点下车人数:50-27=23(人).答:中途下车27人,终点下车23人.