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Explanation
Two trains of equal lengths take 10 seconds and 15 seconds respectively to cross a telegraph post. As, length is given (120m) so individual speeds of both trains will be calculated by the speed distance formula.
In the next step, relative speed would be determined, by adding their speeds because both are moving in opposite direction. And finally,
Time = Distance/Speed
To Find
Time = ?
Solution
Speed of first train = 120/10 = 10 m/sec
Speed of second train = 120/15 = 8 m/sec
Relative speed = 12 + 8 = 20 m/sec
Total length = 120 + 120 = 240m
Now,
Time = distance/speed
Time = 240/20
Time = 12 seconds answer
Conclusion
Two trains of equal lengths take 10 seconds and 15 seconds respectively to cross a telegraph post. If the length of each train be 120 meters, then in 12 seconds they will cross each other travelling in opposite direction.