Task: Question Answering
Input (English): Problem: a trainer is standing in one corner of a square ground of side 25 m . his voice can be heard upto 140 m . find the area of the ground in which his voice can be heard ? 
Options: ['a ) 12300', 'b ) 14500', 'c ) 15400', 'd ) 16700', 'e ) 18200']
Output (English): c