When Wang Ming rushed to the finish line at100m, he was ahead of Liu Ming10m and Li Liang15m. If Liu Ming and Li Liang follow the original speed,
Wang Ming100m, Liu Ming 90m and Li Liang 85m. When Liu Ming reached the finish line, Li Liang ran x meters.
90:85= 100:x
85x=8500
x= 850/9
100-850/9= 50/9 meters
So Li Liang is 50/9 meters short.