A bullet train 130 m long is running with a speed of 50 kmph. In what time will it pass a man who is running at 10 kmph in the direction opposite to that in which the bullet train is going?
Choose one:  A) 23 sec  B) 13 sec  C) 12 sec  D) 11 sec  E) 16 sec
B   13 sec   Speed of the bullet train relative to man = (50 + 10)= 
<gadget id="calculator">(50 + 10)</gadget>
<output>60</output>
60*5/18 m/sec= 30/3 m/sec.   Time taken by the bullet train to cross the man = Time taken by it to cover 130 m at (30/3) m / sec   = (130*3/30)= 
<gadget id="calculator">(130*3/30)</gadget>
<output>13</output>
13 sec
<result>B</result>
A bullet train 130 m long is running with a speed of 50 kmph. In what time will it pass a man who is running at 10 kmph in the direction opposite to that in which the bullet train is going?