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?

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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.**

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