Two trains of equal length are running on parallel lines in the same directions at 46km/hr. and 36km/hr. The faster trains pass the slower train in 72 seconds. The length of each train is: Pick one.
A) 82m  B) 50m  C) 72m  D) 100m  E) None of these
Explanation:   The relative speed of train is 46-36= 
<gadget id="calculator">46-36</gadget>
<output>10</output>
10 Km/hr= (10 X 5) / 18 = 25/9 m/s10×518=259m/s   In 72 secs the total distance traveled is 72x25/9 = 200 m.   Therefore the length of each train is = 200/2= 
<gadget id="calculator">200/2</gadget>
<output>100</output>
100 m.   Answer 100m
<result>D</result>
Two trains of equal length are running on parallel lines in the same directions at 46km/hr. and 36km/hr. The faster trains pass the slower train in 72 seconds. The length of each train is: