Task: Question Answering
Input (English): Problem: a man travelled a distance of 80 km in 7 hours partly on foot at the rate of 8 km per hour and partly on bicycle at 16 km per hour . find the distance travelled on foot . 
Options: a ) 26 km , b ) 32 km , c ) 30 km , d ) 28 km , e ) none
Output (English): b