Task: Question Answering
Input (English): Problem: a man covered a certain distance at some speed . had he moved 3 kmph faster , he would have taken 40 minutes less . if he had moved 2 kmph slower , he would have taken 40 minutes more . the distance ( in km ) is 
Options: a ) 27 , b ) 87 , c ) 40 , d ) 18 , e ) 17
Output (English): c