Answer:
11.6 km
Step-by-step explanation:
You want to know how far north of Q point P is when it lies 45 km away on a bearing of 75°.
In (north, east) coordinates, the location of P relative to Q is ...
P = 45(cos(75°), sin(75°)) ≈ (11.6, 43.5)
Point P lies about 11.6 km north of point Q.