Task: Question Answering
Input (English): Problem: a man covered a certain distance at some speed . if he had 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 . what is the distance in km ? 
Options: a ) 36 , b ) 38 , c ) 40 , d ) 42 , e ) 45
Output (English): c