Two people, one of mass 72.4 kg and the other of mass 60.4 kg, sit in a rowboat

Question

                    Two people, one of mass 72.4 kg and the other of mass 60.4 kg, sit in a rowboat of mass 82.2 kg. With the boat initially at rest, the two                     people, who have been sitting at opposite ends of the boat 1.90 m apart from each other, now exchange seats. How far will the boat move?                 

                    I am having a hard time with this problem, but TIP:                 

                    
                    [first equation M(x)=
                    2nd equation 0(M)+m(x)=
                    
                    take the difference (positive #)
                    divide by Total mass]

I can't get it right... I must be doing some stupid wrong calculation...

I need an answer, I seek help!

I will rate it 5 stars imediatelly, and remember your name....
                

Explanation / Answer

Cm = ((m1A+m2B+m3C)/(m1+m2+m3))

mVcm = m1v1+m2v2+...

solve for v

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