Moving incline plane problem

1. The problem statement, all variables and given/known data

To illustrate there is an incline plane (Mass=M) on a frictionless horizontal plane. It is being pushed by an F force on its non incline side. There is also an m mass on the incline. Mass m does not slide over M. Angle of the incline is Beta. sin B= 0.6, cos B= 0.8, M= 3, m=1, coefficient of friction between two objects= 0.5

If F=30 what is the magnitude of the frictional force between M and m?

2. Relevant equations

3. The attempt at a solution
The asnwer to the question is zero but no matter how I try I cant seem to solve the problem. I tried drawing free body diagrams but dont know what to do next. Please urgent

http://ift.tt/1hSc79s

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