Question

The speed of sound of the whistle is

(A)  340m/s for passengers in A and 310 m/s for passengers in B 

(B)  360m/s for passengers in A and 310 m/s for passengers in B 

(C)  310 m/s for passengers in A and 360 m/s for passengers in B 

(D)  340 m/s for passenger in both the trains.

Answer 1

Correct option  (B) 360m/s for passengers in A and 310 m/s for passengers in B

Explanation:

v_SA = 340 + 20 = 360 m/s

v_SB = 340 – 30 = 310 m/s