Convert $45 k m / h r$ to $m / s e c$ .

10 m / s e c

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10 \frac{1}{2} m / s e c

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90 m / s e c

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12 \frac{1}{2} m / s e c

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Solution

The correct option is C $12 \frac{1}{2} m / s e c$
$1 k m = 1000 m$ and $1 h o u r = 60 \times 60 s e c$
using this information we get
$45 k m / h r = \frac{45 \times 1000 m}{60 \times 60 s e c} = 12.5 m / s e c$
Or is given by $12 \frac{1}{2} m / s e c$

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