Answer:
The acceleration of the boat is:

Step-by-step explanation:
We need to find the total force acting on the boat, first of all.
We have one force (F1) towards the east and a second force (F2) towards the south, forming a right triangle.
So, we can use the Pythagorean theorem to find the magnitude of the total force (F(tot))



Applying Newton's second law, we can find the acceleration of the boat.




I hope it helps you!