Saturday 7 May 2016

IMPORTANT FACTS AND FORMULAE OF TRAINS


1. a km/hr= (a* 5/18) m/s.   

2. a m / s = (a*18/5) km/hr.

3. Time taken by a train of length 1 metres to pass a pole or a standing man or a signal  post is equal to the time taken by the train to cover 1 meter.

4. Time taken by a train of length 1 metres to pass a stationary object of length  b metres is the time taken by the train to cover (1 + b) metres.

 
5. 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.

 
6. 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.

 
7. If two trains of length a metres and b metres are moving in opposite directions at u  m / s and v m/s, then time taken by the trains to cross each other =  (a + b)/(u+v) sec.

 
8.If two trains of length  a metres and b metres are moving in the same direction

at u m / s and v m / s, then the time taken by the faster  train to cross the slower train = (a+b)/(u-v) sec.

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