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A 100 metre...

Question

A $100$ metre long train crosses a pole in 8 seconds. What is its speed in kilometres per hour?

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Solution

Speed (m/h) $= \frac{D i s t a n c e}{T i m e} = \frac{100}{8} m / h$
speed (km/h) $= \frac{25}{2} \times \frac{18}{5} = 45 k m / h$

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