Answer:
1/5 is one out of the 5 parts of the song. Now you need to multiply 1/15 by 5/1. This will give you 5/15 or 1/3 of a minute. It will take him 20 seconds to play the entire song.
Explanation:
20 seconds
1/5 of a song = 1/15 of a minute
Convert the 1/15 into a time based on a minute
1/5 of a song = 4/60 of a minute
Multiply by 5 for the full song
5/5 of a song = 20/60 of a minute
3.6m questions
4.5m answers