Question

If you are going 45 mph, what is your speed in nm per second?

Answer 1

What kind of a ridiculous question is this?

Explanation:

This is an example of a bad question that should never be given to students... I will attempt to solve it anyways.

We are going at a speed of `45 \ "mph"`.

Know that, `1 \ "mph"=1.6 \ "km/h"`

So, in terms of kilometers per hour, we are going at

`45*1.6=72 \ "km/h"`

Now, we need to use the magic number `(3.6)` to convert between `"km/h"` and `"m/s"`.

`1 \ "m/s"=3.6 \ "km/h"`

Therefore, in terms of meters per second, we are going at

`72/3.6=20 \ "m/s"`

Final step is to convert meters to nanometers.

Know that, `1 \ "m"=1*10^9 \ "nm"`

So, we are going at a speed of

`20*1*10^9 \ "nm/s"=2*10^10 \ "nm/s"`