226 seconds
The total minutes of songs James adds to his playlist is 12 minutes.
Convert 12minutes to seconds
[tex]\begin{gathered} 12minutes=12\times60seconds \\ 12minutes=720seconds \end{gathered}[/tex]If he adds 3 songs and the first song and second song lasts 279 seconds and 215 seconds respectively, the amount of time the third song will last is expressed as:
[tex]\begin{gathered} t_3=total\text{ time}-(279+215) \\ t_3=720-494 \\ t_3=226seconds \end{gathered}[/tex]This shows that the third song will lasts 226 seconds
