Puzzle 1 : 2 trains start from respective stations towards each other at the same time say from Delhi & Jaipur. A bird starts with the train from delhi towards the other train & reverses its direction as soon as it reaches the other train coming from Jaipur. Then again as it reaches the train coming from delhi, it again reverses its direction & it continues such a motion till the 2 trains collide. Calculate the distance travelled by the bird till the 2 trains collide. Distance between Delhi & Jaipur was given & speeds of both the trains & the bird was given.