Task: Question Answering
Input (English): Problem: if six machines working at the same rate can do 3 / 4 of a job in 30 minutes , how many minutes would it take two machines working at the same rate to do 3 / 5 of the job ? 
Options: a ) 45 , b ) 60 , c ) 72 , d ) 80 , e ) 100
Output (English): c