If a car is travelling at 21.8 kilometers per hour, how fast is that in millimeters per second?

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If a car is travelling at 21.8 kilometers per hour, how fast is that in millimeters per second?

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Answer 1 · 2015-08-16T00:41:52

I found: $6 \times 10^{3} \frac{m m}{s}$ $6xx10^3(mm)/s$

Explanation:

Consider that:
$21.8 k m = 21.8 \times 1000 m = 21800 m$ $21.8km=21.8xx1000m=21800m$
but $1 m = 1000 m m$ $1m=1000mm$ so:
$21800 m = 21800 \times 1000 = 2.18 \times 10^{7} m m$ $21800m=21800xx1000=2.18xx10^7mm$

$1h=60min=60xx60=3600sec$
So:
$21.8(km)/h=(2.18xx10^7)/(3600)=6xx10^3(mm)/s$

Answer 2 · 2015-08-16T00:43:54

$6055.5"mm/s"$

Explanation:

We have $21.8"km/hr"$

There are 1000m in 1 km so this gives us:

$21.8xx1000" ""m/hr"$

There are 60 min in 1 hour and 60 sec in 1 min so this gives us:

$(21.8xx1000)/(60xx60)" ""m/s"$

There are 1000mm in 1m so this gives us:

$(21.8xx1000xx1000)/(60xx60)" ""mm/s"$

$=6055.5" " "mm/s"$

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If a car is travelling at 21.8 kilometers per hour, how fast is that in millimeters per second?

2 Answers

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