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## Explanation

Two trains 140 and 160 meter long are moving in opposite direction so relative speed will be calculated by adding their speeds.

Time = Distance/Speed

## To Find

Time = ?

## Solution

Relative speed = 60 km/h + 40 km/h

Relative speed = 100 km/h

Now, to change it into m/sec;

Relative speed = (100 x 1000)/3600

Relative speed = 250/9 m/sec

Total distance = 140 + 160 = 300 m

Now,

Time = Distance/Speed

Time = (300 x 9)/250

**Time = 10.8 sec answer**

### Conclusion

If two trains 140 and 160 meter long runs at a speed of 60km/h and 40km/h respectively in opposite directions on parallel tracks. They can cross each other in **10.8 seconds**.