A train 110 meters long takes 6 seconds to cross a man walking at 5 kmph in the direction opposite to that of the train. Find the speed of the train.
Answers:
A) 45 kmph B) 50 kmph C) 55 kmph D) 61 kmph E) 70 kmph
Explanation:   Let the speed of the train be x kmph.   Speed of the train relative to man = (x + 5) kmph = (x + 5) ×5/18 m/sec.   Therefore 110/((x+5)×5/18)=6 &lt;=&gt; 30 (x + 5) = 1980 &lt;=&gt; x = 61   Speed of the train is 61 kmph.   Answer: Option 61 kmph
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A train 110 meters long takes 6 seconds to cross a man walking at 5 kmph in the direction opposite to that of the train. Find the speed of the train.