The diving velocity of a falcon can reach 322 km/hr. if the falcon maintains this velocity for 7.2 seconds (0.002 hours), what will the displacement of the falcon be

Multiply velocity and time and you get 0.644 km, but remember that displacement has a direction and so does velocity, so because velocity is positive in the direction that the falcon is going you have a positive displacement.

322km/hr = 322/3.6 =89.44m/s 
Displacement = 89.44*7.2 sec = 644m = 0.644km