Task: Question Answering
Input (English): Problem: two men start from opposite banks of a river . they meet 340 meters away from one of the banks on forward journey . after that they meet at 170 meters from the other bank of the river on their backward journey . what will be the width of the river ( in meters ) ? 
Options: a ) 750 , b ) 850 , c ) 900 , d ) 980 , e ) 950
Output (English): b