Task: Question Answering
Input (English): Problem: if a farmer wants to plough a farm field on time , he must plough 100 hectares a day . for technical reasons he ploughed only 85 hectares a day , hence he had to plough 2 more days than he planned and he still has 40 hectares left . what is the area of the farm field and how many days the farmer planned to work initially ? 
Options: a ) 600 , b ) 490 , c ) 720 , d ) 1400 , e ) 1679
Output (English): d