Two trains are running in opposite directions with the same speed. If the length of each train is 180 m and they cross each other in 12 sec, then the speed of each train is?  Pick one:  A) 54  B) 77  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 = (180 + 180)/12 =&gt; x = 15   Speed of each train = 10 m/sec.   = 15 * 18/5 =- 54 km/hr.   54nswer: 54
<result>A</result>
Two trains are running in opposite directions with the same speed. If the length of each train is 180 m and they cross each other in 12 sec, then the speed of each train is?