Friction + incline + 2 blocks

Two blocks of mass $m$ and $M$ are kept on a inclined plane with angle of inclination 37 degrees, one above the other. What is the maximum force applied on the block of mass $M$ (down block) so that both blocks move together? Take the friction coefficient between $m$ and $M$ is $K$ .

Details and Assumptions :

$m=5 \text{ kg}, M=10 \text{ kg}, k=0.8, g =10 \text{ m/s}^2$ , wedge angle 37 degrees .