You know there are seconds in a minute. If sound travels meters per second, then it must travel meters in a minute, hence meters in two minutes.
That gives us a speed of meters per two minutes.
Now mile is equivalent to meters, so how many miles make up for meters ? You set up an equation where is the distance in miles, because times the number of miles gives the distance in meters. Divide each side by , and you obtain :
Therefore, in two minutes, sound travels about miles.