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).
Quantitative Aptitude
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Quantitative Aptitude
CH 01Speed, time and distance
Formulas & facts
- Speed
- Distance / Time
- Relative speed (opposite)
- x + y
- Relative speed (same dir.)
- x − y
CH 02Percentage, profit & loss
Key points
- Profit/loss is always calculated on CP; discount on MP.
- Two successive changes a% and b%: net = a + b + ab/100.
- Same SP, one item at x% profit and one at x% loss → always a loss of x²/100 %.
Formulas & facts
- Profit %
- (SP − CP) / CP × 100
- Discount %
- (MP − SP) / MP × 100
- SI
- P × R × T / 100
- CI amount
- P(1 + R/100)^T