Given: Length of trains A and B = 60 m and 50 m Speed of train A = 6 m/s Formula used: Speed = Distance/Time Calculation: Let the speed of train B is x m/s Relative speed = (60 + 50)/11 = 10 m/s Relative speed = (Speed of train + speed of train B) ⇒ 6 + x = 10 ⇒ x = 10 - 6 ⇒ x = 4 m/s