A bird, 720 km away from a train flies towards it at a speed of 120km/h. As soon as it reaches the train, it turns back towards the wall (starting position). The train travels at a speed of 15m/s towards the starting position of the bird. How much distance towards the wall will the bird cover before the train reaches it.
I tried solving this problem by relative speed concept like this: Ratios of velocities (towards:away)=29:11 Thus the ratio of time taken in travelling towards the train to away from the train =11:29 Thus, the bird spent a total of 29/( 29 + 11) × 13.33 hours travelling away from the train. The velocity of the bird travelling away from the train is 120km/h Thus, the distance travelled by the bird away from the train is 13.33 × 29/40 × 120 = 1160 km. But the Text book answer comes out to be 800 Km.Please someone explain me..