Task: Question Answering
Input (English): Problem: audrey 4 hours to complete a certain job . ferris can do the same job in 3 hours . audrey and ferris decided to collaborate on the job , working at their respective rates . while audrey worked continuously , ferris took 1 breaks of equal length . if the two completed the job together in 2 hours , how many minutes long was each of ferris ’ breaks ? 
Options: a ) 5 , b ) 30 , c ) 15 , d ) 20 , e ) 25
Output (English): b