Two trains of equal are running on parallel lines in the same direction at 52 km/hr and 36 km/hr. The faster train passes the slower train in 36 sec. The length of each train is? Pick one.
A) 50 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 = 52 - 36= 
<gadget id="calculator">52 - 36</gadget>
<output>16</output>
16 km/hr.= 16 * 5/18 = 40/9 m/sec.   2x/36 = 40/9 =&gt; x = 80.   ANSWER:80 m
<result>C</result>
Two trains of equal are running on parallel lines in the same direction at 52 km/hr and 36 km/hr. The faster train passes the slower train in 36 sec. The length of each train is?