Unit of measurement, a punk/disco band, was signed up to play a benefit concert for new year's eve. they started at 6: 00 pm on new year's eve and managed to play until 9: 00 am the morning of january 2. to figure out how many minutes they were on stage, what is the conversion ratio you should use? a.60 minutes/1 hour b.60 minutes/1 second c.60 seconds/1 minute d.1 hour/60 minutes