Task: Question Answering
Input (English): Problem: one pipe can fill a tank four times as fast as another pipe . if together the two pipes can fill the tank in 36 minutes , then the slower pipe alone will be able to fill the tank in : 
Options: a ) 180 min , b ) 144 min . , c ) 126 min , d ) 114 min , e ) 124 min
Output (English): a