Two trains are running in opposite directions with the same speed. If the length of each train is 120 m and they cross each other in 12 sec, then the speed of each train is? Choices: A) 10 B) 18 C) 36 D) 72 E) 64
Explanation:   Let the speed of each train be x m/sec.   Then, relative speed of the two trains = 2x m/sec.   So, 2x = (120 + 120)/12 =&gt; x = 10   Speed of each train = 10 m/sec.   = 10 * 18/5 =- 36 km/hr.   ANSWER IS 36
<result>C</result>
Two trains are running in opposite directions with the same speed. If the length of each train is 120 m and they cross each other in 12 sec, then the speed of each train is?