Problems on Trains

Quantitative Aptitude - Problems on Trains

Solve problems involving trains crossing platforms, signals, or each other using relative speed.

1. Concepts

Use relative speed for moving objects: same direction → subtract; opposite direction → add.

2. Basic Formula

Time to cross = Length to cross / Relative speed. Convert speed into same unit as length.

3. Quick Tips

• Use combined lengths when crossing each other.
• Convert speed from km/h to m/s when needed.
• Sketch the scenario to clarify what is crossed.

4. Common Errors

• Forgetting to convert speed units.
• Using wrong relative speed formula.

5. Revision Checklist

• Practice crossing, overtaking and combined length problems.

Summary: Convert speed units, use relative speed, and divide by total length to find time with ease.