Task: Question Answering
Input (English): Problem: a man starts walking at 3 pm . ha walks at a speed of 4 km / hr on level ground and at a speed of 3 km / hr on uphill , 6 km / hr downhill and then 4 km / hr on level ground to reach home at 9 pm . what is the distance covered on one way 
Options: a ) 10 km , b ) 12 km , c ) 14 km , d ) 16 km , e ) 18 km
Output (English): b