Answer for this question is , at zero distance. It is because if there is no resistance,then their speed will never change and thus they will never meet.
This was a USA Talent question.
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Explanation:
Speed of the train =72km/hr=72×5/18 m/sec=
20m/sec
Let the length of the goods train be x m. Then
250+x/20
=26⇒250+x=520⇒x=270m
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72 km per hour is the corrdct snswer.......
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