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

2 Answers
Aug 16, 2015

I found: 6xx10^3(mm)/s6×103mms

Explanation:

Consider that:
21.8km=21.8xx1000m=21800m21.8km=21.8×1000m=21800m
but 1m=1000mm1m=1000mm so:
21800m=21800xx1000=2.18xx10^7mm21800m=21800×1000=2.18×107mm

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

Aug 16, 2015

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"