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Aptitude Topics

Trains

Train problems are a key part of time, speed, and distance aptitude. These problems involve concepts like relative speed, length of trains, and crossing time. They are frequently asked in competitive exams.

Fundamental Principles

Speed

Distance covered per unit time (Speed = Distance / Time).

Relative Speed

Effective speed when two trains move (add for opposite direction, subtract for same direction).

Train Length

Distance covered when a train crosses a pole or platform.

Essential Formulation Tips

  • Always convert speed into m/s for train problems.
  • Use total length when two trains cross each other.
  • For pole crossing, distance = length of train.
  • For platform crossing, distance = train length + platform length.

Shortcut Execution Techniques

  • Conversion: km/hr × 5/18 = m/s.
  • Opposite direction → add speeds.
  • Same direction → subtract speeds.
  • Time = Distance / Speed.

Contextual Inquiries (FAQs)

Q: Why use meters and seconds in train problems?

A:

Q: What is the most important concept in train problems?

A: