question_answer 25)

An aircraft is flying at a height of 3400 m above the ground. If the angle subtended at a ground observation point by the aircraft positions 10 s apart is 30°, what is the speed of the aircraft ?  

Answer:

Let A and B represent the two aircraft positions separted 10 s apart (Fig. 4.108).     Fig. 4.108 Then   or                              . Speed of aircraft .