How many seconds will a 900 meter long train take to cross a man walking with a speed of 3 km/hr in the direction of the moving train if the speed of the train is 63 km/hr?	Options:
A) 287	B) 288	C) 500	D) 400	E) 121
Let length of tunnel is x meter   400istance = 900+x meter   Time = 1 minute = 60 seconds   Speed = 78 km/hr = 78*5/18 m/s = 65/3 m/s   400istance = Speed*Time   900+x = (65/3) * 60   900+x = 20 * 65= 
<gadget id="calculator">20 * 65</gadget>
<output>1_300</output>
1300   x= 1300 - 900= 
<gadget id="calculator">1300 - 900</gadget>
<output>400</output>
400 meters   Answer: 400
<result>D</result>
How many seconds will a 900 meter long train take to cross a man walking with a speed of 3 km/hr in the direction of the moving train if the speed of the train is 63 km/hr?