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

2 Answers
Aug 16, 2015

Answer:

I found: #6xx10^3(mm)/s#

Explanation:

Consider that:
#21.8km=21.8xx1000m=21800m#
but #1m=1000mm# so:
#21800m=21800xx1000=2.18xx10^7mm#

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

Aug 16, 2015

Answer:

#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"#