A train is moving due east and a car is moving due north with equal speeds. A passenger in the train finds that the car is moving towards

velocity of the car along north V$\hat{j}$ and that of train along east $V\hat{i}$

velocity of the car with respect to train is V$\hat{j}$-V$\hat{i}$

From the velocity diagram it is clear that  velocity of the car with respect to train is due  north- west.