先把3/5m换算成0.6m,1/10m换算成0.1m.
(0.6m-0.1m)/(1-40%-40%)=2.5m.2.5*40%=1m(泥中) 1m-0.1=0.9m(水中).
验算:0.6+0.9+1=2.5米