Two trains 136 m and 185 m in length respectively are running in opposite directions, one at a speed of 70 km/h and the other at a speed of 65 km/h. In what time will they be completely clear of each other from the moment they meet?

Explanation

​Given: Train lengths =136 m and 185 m, Speeds of trains =70 km/h and 65 km/h Formula Used: Relative Speed = Speed1 + Speed2 (for opposite directions)​ ​ ​ Total Distance Time = ​ Relative Speed ​ Solution: Relative Speed = 70 + 65 = 135 km/h Changing the speed into m/sec 135 × 1000 ​= = 37.5 m/s​ 3600 ​ Total Distance = 136 + 185 = 321 m Now, 321 Time = = 8.56 seconds​ 37.5 ​ 3 1 2 +( 5)