Task: Question Answering
Input (English): Problem: a man walking at the speed of 4 kmph crosses a square field diagonally in 3 minutes . the area of the field is : 
Options: ['a ) 18000 m 2', 'b ) 20000 m 2', 'c ) 19000 m 2', 'd ) 25000 m 2', 'e ) 15000 m 2']
Output (English): b