tag:blogger.com,1999:blog-6982235600466323980.post1201691706867754401..comments2020-03-20T11:12:19.994-07:00Comments on Puzzles in Job Interviews: Bird Running Between Trains - Classic PuzzleMohd Anwar Jamal Faizhttp://www.blogger.com/profile/01684801075444232559noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-6982235600466323980.post-80264452738190342002015-02-06T11:27:21.508-08:002015-02-06T11:27:21.508-08:00i am giving a probable solution. Better is left fo...i am giving a probable solution. Better is left for audience to solve, or else what will be the puzzle the. Hehe :)<br /><br />The concept of relative speed (rings a bell?) can work handy here. Letâ€™s assume that the distance between City X and City Y is d miles. The trains are approaching each other at a relative speed of (20 + 15) = 35 mph. The sum of the distances covered by the trains when they collide is d (i.e. the distance between the cities). Since distance/speed gives us time, we know that the trains collide d/35 hours after they start.<br /><br />Since the speed of the bird is constant at 25 mph, we know that the bird would have covered<br /><br />25 * (d/35) miles = 5d/7 miles<br /><br />before the trains collide.Mohd Anwar Jamal Faizhttps://www.blogger.com/profile/01684801075444232559noreply@blogger.comtag:blogger.com,1999:blog-6982235600466323980.post-80689482630045887332014-12-16T01:01:29.007-08:002014-12-16T01:01:29.007-08:00I think distance between city X and city Y should ...I think distance between city X and city Y should be given. Anonymousnoreply@blogger.com