A block P weighing 200KN rests on the top of the block Q of weight 300KN and they are connected by a common string passing around a frictionless pulley S which is tied to a vertical wall by a horizontal string as shown if the coefficient of friction between the rubbing surfaces of the block P and block Q is 0.4 while that between the floor and the block Q is 0.3 determine the force F required to pull the block Q and the tension in each string