A block of mass $m$ on a frictionless inclined plane of angle $\theta$ is connected by a cord over a small frictionless, massless pulley to a second block of mass $M$ hanging vertically, as shown. If $M=1.5m$, and the acceleration of the system is $\frac{g}{3}$, where $g$ is the acceleration of gravity, what is $\theta$, in degrees, rounded to the nearest integer? 
[asy]size(12cm);
pen p=linewidth(1), dark_grey=gray(0.25), ll_grey=gray(0.90), light_grey=gray(0.75);

pair B = (-1,-1);
pair C = (-1,-7);
pair A = (-13,-7);
path inclined_plane = A--B--C--cycle;
draw(inclined_plane, p);
real r = 1; // for marking angles
draw(arc(A, r, 0, degrees(B-A))); // mark angle
label("$\theta$", A + r/1.337*(dir(C-A)+dir(B-A)), (0,0), fontsize(16pt)); // label angle as theta
draw((C+(-r/2,0))--(C+(-r/2,r/2))--(C+(0,r/2))); // draw right angle

real h = 1.2; // height of box
real w = 1.9; // width of box
path box = (0,0)--(0,h)--(w,h)--(w,0)--cycle; // the box

// box on slope with label
picture box_on_slope;
filldraw(box_on_slope, box, light_grey, black);
label(box_on_slope, "$m$", (w/2,h/2));

pair V = A + rotate(90) * (h/2 * dir(B-A)); // point with distance l/2 from AB
pair T1 = dir(125); // point of tangency with pulley
pair X1 = intersectionpoint(T1--(T1 - rotate(-90)*(2013*dir(T1))), V--(V+B-A)); // construct midpoint of right side of box
draw(T1--X1); // string
add(shift(X1-(w,h/2))*rotate(degrees(B-A), (w,h/2)) * box_on_slope);

// picture for the hanging box
picture hanging_box;
filldraw(hanging_box, box, light_grey, black);
label(hanging_box, "$M$", (w/2,h/2));

pair T2 = (1,0);
pair X2 = (1,-3);
draw(T2--X2); // string
add(shift(X2-(w/2,h)) * hanging_box);

// Draws the actual pulley
filldraw(unitcircle, grey, p); // outer boundary of pulley wheel
filldraw(scale(0.4)*unitcircle, light_grey, p); // inner boundary of pulley wheel
path pulley_body=arc((0,0),0.3,-40,130)--arc((-1,-1),0.5,130,320)--cycle; // defines "arm" of pulley
filldraw(pulley_body, ll_grey, dark_grey+p); // draws the arm
filldraw(scale(0.18)*unitcircle, ll_grey, dark_grey+p); // inner circle of pulley[/asy][i](Proposed by Ahaan Rungta)[/i]
1. **Identify the forces acting on each block:**
   - For the block of mass \( M \) hanging vertically, the forces are:
     - Gravitational force: \( Mg \)
     - Tension in the cord: \( T \)
   - For the block of mass \( m \) on the inclined plane, the forces are:
     - Gravitational force component parallel to the incline: \( mg \sin \theta \)
     - Tension in the cord: \( T \)

2. **Write the equations of motion for each block:**
   - For the hanging block \( M \):
     \[
     Mg - T = Ma
     \]
   - For the block on the inclined plane \( m \):
     \[
     T - mg \sin \theta = ma
     \]

3. **Substitute the given values:**
   - Given \( M = 1.5m \)
   - Given \( a = \frac{g}{3} \)

4. **Substitute \( M \) and \( a \) into the equations:**
   - For the hanging block:
     \[
     1.5mg - T = 1.5m \left( \frac{g}{3} \right)
     \]
     Simplify:
     \[
     1.5mg - T = 0.5mg
     \]
     \[
     T = 1.5mg - 0.5mg = mg
     \]

   - For the block on the inclined plane:
     \[
     T - mg \sin \theta = m \left( \frac{g}{3} \right)
     \]
     Substitute \( T = mg \):
     \[
     mg - mg \sin \theta = \frac{mg}{3}
     \]
     Simplify:
     \[
     mg (1 - \sin \theta) = \frac{mg}{3}
     \]
     Divide both sides by \( mg \):
     \[
     1 - \sin \theta = \frac{1}{3}
     \]
     \[
     \sin \theta = 1 - \frac{1}{3} = \frac{2}{3}
     \]

5. **Find the angle \( \theta \):**
   \[
   \theta = \arcsin \left( \frac{2}{3} \right)
   \]
   Using a calculator to find the angle in degrees:
   \[
   \theta \approx 41.81^\circ
   \]
   Rounding to the nearest integer:
   \[
   \theta \approx 42^\circ
   \]

The final answer is \(\boxed{42^\circ}\).