Two trains are moving in the same direction at 72 kmph and 36 kmph. The faster train crosses a man in the slower train in 18 seconds. Find the length of the faster train?  Answers.
A) 270	B) 277	C) 187	D) 180	E) 271
Relative speed = (72 - 36) * 5/18 = 2 * 5= 
<gadget id="calculator">2 * 5</gadget>
<output>10</output>
10 mps.   Distance covered in 18 sec= 18 * 10= 
<gadget id="calculator">18 * 10</gadget>
<output>180</output>
180 m.   The length of the faster train= 180 m.   Answer: 180
<result>D</result>
Two trains are moving in the same direction at 72 kmph and 36 kmph. The faster train crosses a man in the slower train in 18 seconds. Find the length of the faster train?