If light moves at a speed of about 3.00 x 108 m/s, how long will it take light to travel the distance of a marathon (about 42.2 km)? express your answer in microseconds using the correct number of significant figures. do not enter your answer using scientific notation.

The time taken in microseconds equals 140.7 microseconds

Explanation:

From the basic relation of speed, distance and time we can write

In our case distance equals 42.2 kilometers which equals

Using the given values in the above relation we get

Converting into microseconds we get