The answer is 54. You have to first redraw the diagram. First draw a line from P to R.Then draw a perpendicular from <S to the line PR. 
    We know that all the angles of a rectangle is 90.In the question the angle S is in the ratio 2:3. 
   Let the angles be x; 2x +3x=90(all the angles of rect. is 90). you'll get the answer 54 and 36. Now look into the diagram. Consider the triangle PST. 
In it <S=54,<T=90,<P=180-(54+36) i.e;<P=36.
The question is to find <TPQ. It is equal to 90-36=54
  You just have to concentrate in your diagram and you'll  surely get the answer