Current speed of rescue boat = 60-15 = 45 km/h.

After hitting the rocks, the fishing boat speed is 0, and the water speed is 15, so the speed is 15.

50/( 15+45)= 5/6 & lt； six

So I can

2. Let the distance be S, the speed of the express train is s/5, and the speed of the local train is s/8. When they meet, the time for the local train to travel is = (S-S/5 * 2)/(S/5+S/8) = 24/13.

When they meet, the distance of the express train = s/5 * 2+s/5 * 24/13 = (10/13) s = s/2+10.

S = 2860/7 km