Task: Question Answering
Input (English): Problem: a boat takes 38 hours for travelling downstream from point a to point b and coming back to point c midway between a and b . if the velocity of the stream is 4 kmph and the speed of the boat in still water is 14 kmph , what is the distance between a and b ? 
Options: a ) 240 km , b ) 120 km , c ) 360 km , d ) 180 km , e ) none of these
Output (English): c