Assume that the unit vector points in the positive x direction and the unit vector points in the positive y direction as shown in figure above.
The velocity of the Police car with respect to ground is:

The negative sign highlights the fact that the police car moves in a direction opposite to that of unit vector .
Similarly, the velocity of the motorcyclist with respect to ground is:

The negative sign highlights the fact that the motorcyclist moves in a direction opposite to that of unit vector .
The velocity of the motorcyclist with respect to police car is given as:


Round off to two significant figures,

Therefore, the magnitude of velocity of motorcyclist with respect to police car is 98 km/h .

Round off to two significant figures,
θ = - 39°
Here, L is the separation between the motorcyclist and the intersection point whereas H is the separation between the police car and intersection point (refer figure).

Round off to two significant figures,