# Two trains 100m and 90m are running on parallel lines in the same direction with speeds 35km/h and 50km/h respectively. In what time will they pass each other?Please give the solution with all the...

Two trains 100m and 90m are running on parallel lines in the same direction with speeds 35km/h and 50km/h respectively. In what time will they pass each other?

Please give the solution with all the steps.

justaguide | College Teacher | (Level 2) Distinguished Educator

Posted on

The trains are 100m and 90m long and are running on parallel lines in the same direction. The speed of the trains is 35 km/h and 50 km/h respectively.

The faster train will cross the slower one and to do so it has to travel a distance equal to the sum of the length of the two trains. This is equal to 100 + 90 = 190 m. The difference in the speed of the two trains is 50 - 35 = 15 km/h, this is the speed with which the faster train moves ahead of the slower one.

To travel a distance of 190 m at 15 km/h requires a time equal to 0.190/15 = 19/1500 hr or 0.76 minutes

The trains cross each other in 0.76 minutes.