Task: Question Answering
Input (English): Problem: two twins sisters sita and geeta were standing back to back and suddenly they started running in opposite directions for 10 km each . then they turned left and ran for another 7.5 km . what is the distance ( in kilometers ) between the the two twins when they stop ? 
Options: a ) 21 , b ) 23 , c ) 25 , d ) 27 , e ) 30
Output (English): c