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Trigonometric Ratios

A train is ru...

Question

A train is running at a speed of $40 k m / h r$ and it crosses a post in $18$ seconds. What is the length of the train?

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Solution

$\begin{matrix} S p e e d = 40 k m / h = 40 \times \frac{5}{18} = \frac{100}{9} m / s T i m e = 18 sec D i s tan c e, c o v e r e d = \frac{100}{9} \times 18 = 200 m H e n c e, l e n g t h o f t h e t r a i n = 200 m . \end{matrix}$

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