1.

Two trains are each 50 m long moving parallel towards each other at speeds `10 ms^(-1)` and `15 ms^(-1)` respectively, at what time will they pass each other ?A. 8 sB. 4 sC. 2 sD. 6 s

Answer» Correct Answer - B
`upsilon_(r )=10+15=25 ms^(-1)`
where, `upsilon_(r )` is relative velocity
`therefore t=(50+50)/(25)=4s`
As both trains are 50m long 
so distance to be travel is 50+50 = 100m

As there velocities are in opposite directions
10m/s and 15m/s 

Relative velocity is 15+10 = 25m/s

time=distance/velocity = 100/25 = 4sec B.


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