Answer to Question #40445 in Acoustics for divya sahu

Question

a siren paced at a railway platform is emitting sound of frequency 5000 hz . a passenger sitting in a moving train A records a frequency of 5.5 khz while train approaches the sirens .during his return journey in a different train B he records a frequency of khz while approaching the same siren . the ratio of the velocity of train B to that of train A is??