Express the following speed in $k m / h r$ :
$20 m / s$

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Solution

Converting the speed from $m / s$ to $k m / h r$
We know that, $1 k m / h r = \frac{5}{18} m / s$ and
$1 m / s = \frac{18}{5} k m / h r$
$\Rightarrow 20 m / s = 20 \times \frac{18}{5} k m / h r$
$\Rightarrow 20 \times \frac{18}{5} = 72 k m / h r$
Hence, $20 m / s$ can be expressed as $72 k m / h r$ .

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Express the following speed in km/hr:20m/s

Converting the speed from m/s to km/hrWe know that, 1km/hr=518m/s and1m/s=185km/hr⇒20m/s=20×185km/hr⇒20×185=72km/hrHence, 20m/s can be expressed as 72km/hr.

Express the following speed in $k m / h r$ :
$20 m / s$