5 topics · every exam question type
🔺1. Speed–Distance–Time BasicsThe s = d/t triangle and km/h ↔ m/s conversion1 type📊2. Average SpeedTotal distance ÷ total time; harmonic mean 2xy/(x+y)1 type⏱️3. Speed Change & Rest StopsEarly/late arrival, rest periods, there-and-back3 types🔀4. Relative SpeedAdd (opposite) / subtract (same dir); meeting-point ratio3 types🚆5. TrainsCrossing a pole/platform and two trains crossing2 types