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Note for Problems on Trains - PT by Placement Factory

  • Problems on Trains - PT
  • Note
  • Quantitative Aptitude
  • Placement Preparation
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the concept of dealing with “Problems on Trains” so that candidate would be able to handle the quantitative problems of the real world easily and conveniently and hence in their competitive exams. Candidates are advised to handle the Digi-notes by keeping in mind that they are going to LEARN (NOT STUDY) the Problems on trains so that you; yourself would be able to minimize the steps required to conclude the answer of the question and hence develop the SHORT TRICKS. All the best… Contents 1. Preface …………………………………………………………………………………..2 2. Contents …………………………………………………………………………………3 3. Introduction ……………………………………………………………………………4 Page 4 of 18

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4. Self Analysis Time …………………………………………………………………..4 Problems On Trains Introduction Page 5 of 18

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In the discussion till now (as in the diginotes of the Speed Time and Distance); we never included the length of the moving object in the distance covered. The problem based on trains is a special case of speed time and distance in which the length of the moving objects becomes the distance covered. How we would be able to identify whether the length of the moving objects should considered as the distance covered? It will be told by the “Time of Crossing”. That will tell us whether we should consider the length of the moving object as distance or not as illustrated with the help of the following discussion. Self Analysis Time 1. A train running at the speed of 60 km/hr. crosses a pole in 9 seconds. What is the length of the train? Page 6 of 18

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D  ST 5   L   60   m / s  9 s 18    L  150 m 2. A train 125 m long passes a man, running at 5 km/hr. in the same direction in which the train is going, in 10 seconds. Find the speed of the train. D  ST 5   125m  S Train  5   m / s  10 s 18    S Train  50 km / hr. 3. Find the length of the bridge, which a train 130 meters long and travelling at 45 km/hr. can cross in 30 seconds. D  ST 5   L  130   45  m / s  30s 18    L  245m 4. Two trains running in opposite directions cross a man standing on the platform in 27 seconds and 17 seconds respectively and they cross each other in 23 seconds. Find the ratio of their speeds. Page 7 of 18

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