📚 How to solve related rates problems with derivatives (Question 3)

Q. Ship A leaves a port P and travels west at 11.5 km∕h.

After 2.25 h, ship B leaves P and travels north at 19.4 km∕h.

How fast are the ships separating 5.00 h after the departure of A?

Source: Technical Mathematics with Calculus, 3e. Calter & Calter.