Question Bank • QB_GA_080 NAT • 2 Marks

Section 8: General Aptitude

Quantitative Aptitude

Subtopic: Numerical Computation

Question Statement:

A car travels the first half of a distance at a speed of $40\text{ km/h}$ and the second half of the distance at $60\text{ km/h}$. Calculate the average speed of the car for the entire journey in $\text{km/h}$.

Answer Key:

48

Step-by-Step Solution & Explanation

For equal distances covered at speeds $v_1$ and $v_2$, the average speed is the harmonic mean: $v_{\text{avg}} = \frac{2 v_1 v_2}{v_1 + v_2} = \frac{2 \times 40 \times 60}{40 + 60} = \frac{4800}{100} = 48.0\text{ km/h}$
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