Key points
- km/h to m/s: × 5/18. m/s to km/h: × 18/5.
- Train crossing a pole/person: distance = length of the train.
- Train crossing a platform: distance = train + platform.
- Same distance at two speeds: average speed = 2xy / (x + y).
Notes / SSC CGL / Quantitative Aptitude
CH 01Speed, time and distance
Quantitative Aptitude · SSC CGL
Formulas & facts
- Speed
- Distance / Time
- Relative speed (opposite)
- x + y
- Relative speed (same dir.)
- x − y