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Unitary Method

A train cover...

Question

A train covers $120 m$ in $5$ seconds. What is the speed of the train in $k m / h r$ ?

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Solution

$s p e e d = \frac{d i s t a n c e}{t i m e}$
$= \frac{120}{5}$
$= 24 m / sec$
$= 24 \times \frac{3600}{1000}$
$= \frac{24 \times 18}{5}$
$= \frac{432}{5}$
$= 86.5 k m / h r$

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