Answer:
.65
Step-by-step explanation:
meta
Total duration of songs: 5.15 + 4.4 + 4.8 = 14.35 minutes
Subtract the total duration from the available time: 15 - 14.35 = 0.65 minutes
Mario will have room for approximately 0.65 minutes, or about 40 seconds, after uploading the three songs.