A piece of music with a tempo of 100 beats per minute (bpm) has a playing time of 3 minutes. The piece is edited to have a playing time of 120 beats per minute.

Question

How long will the edited piece play in minutes?

2.0 minutes

4.0 minutes

2.5 minutes

3.5 minutes

Answer 1

It plays faster by a ratio of 120/100 so will take 100/120 times as long
3 * 100/120 = 100 / 40 = 5/2 = 2.5