What distance does electromagnetic radiation travel in 45.0 μs?

The speed of light (electromagnetic radiation) is equal to 299 792 458 m / s or 3x10^8 m/s in scientific notation.

So with this information, we could now look for the distance. Solution:

Take note that μs means microseconds.

Speed of light * microseconds travelled * actual amount of microseconds

(3x10^8 m/s) (45.0 μs) (1x10^-6 s/μs) = 13,500 m.