Question Bank • QB_GA_067 NAT • 2 Marks

Section 8: General Aptitude

Quantitative Aptitude

Subtopic: Numerical Computation

Question Statement:

A train of length $240\text{ m}$ traveling at a uniform speed of $72\text{ km/h}$ completely crosses a railway bridge in $30\text{ seconds}$. Calculate the length of the bridge in $\text{meters}$.

Answer Key:

360

Step-by-Step Solution & Explanation

Speed of train: $v = 72\text{ km/h} = \frac{72 \times 5}{18} = 20\text{ m/s}$ Total distance covered in $30\text{ s}$: $D = v \times t = 20 \times 30 = 600\text{ m}$ Distance is sum of train length and bridge length: $L_{\text{train}} + L_{\text{bridge}} = 600$ $240 + L_{\text{bridge}} = 600 \implies L_{\text{bridge}} = 600 - 240 = 360\text{ m}$
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