Two trains are running in opposite directions with the same speed. If the length of each train is 240 m and they cross each other in 12 sec, then the speed of each train is?  Answers:  A) 22  B) 77  C) 72  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 = (240 + 240)/12 =&gt; x = 20   Speed of each train = 20 m/sec.   = 20 * 18/5 =- 72 km/hr.Answer: 72
<result>C</result>
Two trains are running in opposite directions with the same speed. If the length of each train is 240 m and they cross each other in 12 sec, then the speed of each train is?