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 7 seconds. Find the length of the faster train?	Choose the correct answer.
A) 70
B) 20
C) 30
D) 75
E) 15
Relative speed = (72 - 36) * 5/18 = 2 * 5= 
<gadget id="calculator">2 * 5</gadget>
<output>10</output>
10 mps.   Distance covered in 27 sec= 7 * 10= 
<gadget id="calculator">7 * 10</gadget>
<output>70</output>
70 m.   The length of the faster train= 70 m.   70nswer: 70
<result>A</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 7 seconds. Find the length of the faster train?