Screening — RisingBrain

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Quant Aptitude

6 questions

Time, Speed & Distance

Everything comes from $D = S \times T$ .

Unit conversion: km/hr → m/s multiply by $\frac{5}{18}$ ; m/s → km/hr multiply by $\frac{18}{5}$ .

Average speed $= \dfrac{\text{total distance}}{\text{total time}}$ — never the average of the speeds.

Same direction: $S_1 - S_2$ . Opposite directions: $S_1 + S_2$ .

D = \frac{S_1 \times S_2}{\lvert S_1 - S_2\rvert}\times \Delta T

$\Delta T$ = total time gap (add the early + late minutes), converted to hours.

Downstream $D = B + S$ ; upstream $U = B - S$ . Hence $B = \dfrac{D+U}{2}$ and .