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 ) 35 , b ) 36 , c ) 37 , d ) 40 , e ) 45
Output (English): d