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Explanation
A 500 meter long train crosses a man who is walking with a speed of 3km/h and the speed of the train is 63km/h.
The direction is same so relative speed will be calculated by subtracting 3km/h from 63km/h.
As, the length of the train is given, so by using speed, distnce, time formula;
Time = Distance/Speed
To Find
Time = ?
Solution
Relative speed = 63 km/h – 3 km/h
Relative speed = 60 km/h
Now, to change it into m/sec;
Relative speed = (60 x 1000)/3600
Relative speed = 50/3 m/sec
Now,
Speed = Distance/Time
Time = Distance/Speed
Time = (500 x 3)/50
Time = 30 sec answer
Conclusion
A 500 meter long train will take 30 seconds to cross a man walking with a speed of 3km/h in the direction of the moving train.
