Two trains are running in opposite directions with the same speed. If the length of each train is 100 m and they cross each other in 10 sec, then the speed of each train is?  Choose the correct choice from the following answers.
A) 22
B) 18
C) 36
D) 88
E) 21
Let the speed of each train be x m/sec.   Then, relative speed of the two trains = 2x m/sec.   So, 2x = (100 + 100)/10 =&gt; x = 5   Speed of each train = 5 m/sec.   = 5 * 18/5 =- 18 km/hr.Answer: 18
<result>B</result>
Two trains are running in opposite directions with the same speed. If the length of each train is 100 m and they cross each other in 10 sec, then the speed of each train is?