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# Which of the following relations is correct?

$(i).\ Speed=Distance\times Time$

$(ii).\ Speed=\frac{Distance}{Time}$

$(iii).\ Speed=\frac{Time}{Distance}$

$(iv).\ Speed =\frac{1}{Distance\times Time}$

The correct answer is: **$(ii).\ Speed=\frac{Distance}{Time}$**

__Explanation:__

Distance traveled per unit of time by a moving object is called its speed.

So, **$\boxed{Speed=\frac{Distance}{Time}}$**

The above relation can also be expressed in the following ways:

$\boxed{Time=\frac{Distance}{speed}}$

$\boxed{Distance=Speed\times Time}$

SI unit of speed is **meter per second$(m/s)$.**

Therefore, only $\boxed{Speed=\frac{Distance}{Time}}$ is the correct relation among the given relations.

Hence, option $(ii).\ Speed=\frac{Distance}{Time}$ is correct.

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