# Problems on Trains Subject: Quantitative Aptitude    Exam: CAT

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## Important Points

Time taken by a train of length l meters to pass a pole or a standing man or a signal post is equal to the time taken by the train to cover l meters.
Time taken by a train of length l meters to pass a stationary object of length b meters is the time taken by the train to cover (l + b) meters.
Suppose two trains or two bodies are moving in the same direction at u m/s and v m/s, where u>v, then their relatives speed = (u -v) m/s.
Suppose Two trains or two bodies are moving in opposite directions at u m/s and v m/s, then their relative speed is = (u + v) m/s.  SimplyLearnt