Allied & ICAR Exam Bank • ALLIED_1993 NAT • 1 Mark

Section 8: General Aptitude

Quantitative Aptitude

Subtopic: Numerical Computation

Question Statement:

A train running at uniform speed passes two bridges of lengths 300 m and 240 m in 21 seconds and 18 seconds respectively. The length of the train in meters is:

Answer Key:

120

Step-by-Step Solution & Explanation

Let length be $L$ and speed $v$. $(L + 300)/21 = (L + 240)/18 \implies 6(L + 300) = 7(L + 240) \implies 6L + 1800 = 7L + 1680 \implies L = 120$ m.
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