Two trains X and Y (80 km from each other) are running towards each other on the same track with a speed of 40km/hr. A bird starts from the train X and travels towards train Y with constant speed of 100km/hr. Once it reaches train Y, it turns and starts moving toward train X. It does this till the two trains collides with each other. Find the total distance traveled by the bird?  Choose the correct answer:	A) 120	B) 100	C) 240	D) 232	E) 221
100   100 km   Velocity of approach for the two trains = (40 + 40) km/hr   Total time the trains will take to collide = 80km/80km/hr = 1 hour   Total distance travelled by the bird = 100km/hr * 1hr = 100 km.
<result>B</result>
Two trains X and Y (80 km from each other) are running towards each other on the same track with a speed of 40km/hr. A bird starts from the train X and travels towards train Y with constant speed of 100km/hr. Once it reaches train Y, it turns and starts moving toward train X. It does this till the two trains collides with each other. Find the total distance traveled by the bird?