Solving a problem in physics section 9 point 58 mechani

58. Two identical boats mass m = 200 kg each (along with boaters and cargo in the boat) move parallel courses towards each other with the same speed of v = 1 m / s. When the boat came abreast, the first boat to the second and from second to first while relocating loads masses m1 = 20 kg. Determine the speed u1 and u2 after throwing cargo boats.