Passengers in the jet transport A flying east at a speed of 800 [km/h] observe a second jet plane B that passes under the transport in horizontal flight. Although the nose of B is pointed in the 45° northeast direction, plane B appears to the passengers in A to be moving away from the transport at the 60° angle as shown. Determine the true velocity (in[km/h]) of B.

Fig: 1

Fig: 2