1.

1). 14 seconds2). 15 seconds3). 18 seconds4). 16 seconds

Answer»

Relative SPEED between TWO trains = 72km/hr. or 20m/s

Let the length of train B be L m

Acc. to the question, $(\frac{{150 + \;L}}{{13}} = 20)$

Or, L = 110m

And, $(\frac{{190 + 110}}{{20}} = \;\frac{{300}}{{20}} = 15)$

∴ Time TAKEN by train B to cross train C is 15 seconds.


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