Task: Question Answering
Input (English): Problem: the cross - section of a cannel is a trapezium in shape . if the cannel is 15 m wide at the top and 4 m wide at the bottom and the area of cross - section is 1900 sq m , the depth of cannel is ? 
Options: a ) 150 , b ) 200 , c ) 140 , d ) 240 , e ) 145
Output (English): b