Pulley problem

1. The problem statement, all variables and given/known data
Two particles of masses m and 2m lie together on a smooth horizontal table. A string which joins them hangs over the edge and supports a pulley carrying a mass 3m. prove that the acceleration of the latter mass is 9g/17

2. Relevant equations
f=m1g/m1+m2

3. The attempt at a solution
Here, I think by the latter mass they mean is the one carrying 3m. The system is moving down with an acceleration f due to the mass 3m. Will the two particles m and 2m have different acceleration in the same direction?? I am really at a sheer loss as to where I should with this problem. Any help would be greatly appreciated….

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