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In one km race A beats B by 4 seconds or 40 metres. How long does B take to run the kilometer?

112 sec
110 sec
101 sec
100 sec
Explanation:

This means, B takes 4 seconds to run 40 metres

$\text{=> B takes }\dfrac{4}{40} = \dfrac{1}{10}\text{ seconds to run 1 metre}$

$\text{=> B takes }\dfrac{1}{10} \times 1000 = 100 \text{ seconds to run 1000 metre}$

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