Problems on Trains - Important Formulas

Published on:  2016-11-04
Posted by:  Admin


Problems on Trains - Important Formulas
 
 
1.    km/hr to m/s conversion:
 
       a km/hr = (a * (5/18)) m/s
 

2.    m/s to km/hr conversion:

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


Formulas for finding Speed, Time and Distance 
 
3.    Time taken by a train of length l meters to pass a pole or standing man or a signal post is equal to the time taken by the train to cover l meters.

 
4.    Time taken by a train of length l meters to pass a stationery object of length b meters is the time taken by the train to cover
(l + b) meters .
 

 
5.    Suppose two trains or two objects bodies are moving in the same direction at u m/s and v m/s, where u > v, then their relative speed is = (u - v) m/s.
 

6.    Suppose two trains or two objects 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 meters and b meters are moving in opposite directions at u m/s and v m/s, then:
 
The time taken by train to cross each other = (a + b) / (u + v) sec.
 


8.    If two trains of length a meters and b meters 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
 


9.    If two trains (or bodies) start at the same time from points A and B towards each other and after crossing they take a and b sec in reaching B and A respectively, then:
           (As speed) : (Bs speed) = (b : a)
 
 

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