Two trains of equal are running on parallel lines in the same direction at 42 km/hr and 36 km/hr. The faster train passes the slower train in 36 sec. The length of each train is?	Choose the correct option: A) 30 m B) 72 m C) 80 m D) 82 m E) 84 m
Let the length of each train be x m.   Then, distance covered = 2x m.   Relative speed = 42 - 36= 
<gadget id="calculator">42 - 36</gadget>
<output>6</output>
6 km/hr.= 6 * 5/18 = 5/3 m/sec.   2x/36 = 5/3=&gt; x = 30.   30 mNSWER:30 m
<result>A</result>
Two trains of equal are running on parallel lines in the same direction at 42 km/hr and 36 km/hr. The faster train passes the slower train in 36 sec. The length of each train is?