Question

# Speed of $90km/h$ when expressed in $m/s$ is _____.

A

$9000m/s$

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B

$90m/s$

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C

$25m/s$

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D

$20m/s$

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Solution

## The correct option is C $25m/s$Step 1: Given dataSpeed $=90km/h$Step 2: Converting the speed from $km/h$ into $m/s$We know that $1km=1000m$ and $1h=60×60s=3600s$. To convert $km/h$ into $m/s$, simply put the values of kilometers in meters and the value of hours in seconds.$90km/h=90×\frac{1000m}{3600s}\phantom{\rule{0ex}{0ex}}⇒90km/h=90×\frac{5}{18}m/s\phantom{\rule{0ex}{0ex}}⇒90km/h=25m/s$So, the speed of $90km/h$ when expressed in $m/s$ is $25m/s$.Hence, the correct answer is option C.

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