Two trains are running in opposite directions with the same speed. If the length of each train is 300 m and they cross each other in 12 sec, then the speed of each train is?  Choose the correct choice from the following answers:
A) 22
B) 77
C) 36
D) 1908
E) 21
Let the speed of each train be x m/sec.   Then, relative speed of the two trains = 2x m/sec.   So, 2x = (300 + 300)/15 =&gt; x = 30   Speed of each train = 30 m/sec.   = 30 * 18/5 =- 1908 km/hr.Answer: 1908
<result>D</result>
Two trains are running in opposite directions with the same speed. If the length of each train is 300 m and they cross each other in 12 sec, then the speed of each train is?