I can't seem to figure this problem out

A point p is moving along the curve whose equation is y= x^(1/2). Suppose that x is increasing at the rate of 4 units per second when x=3

a. how fast is the distance between P and the point (2,0) changing at this instant?

b. How fast is the angle of inclination of the line segment from P to (2,0) changing at this instant?

Thanks