Task: Question Answering
Input (English): Problem: a person travels equal distances with speeds of 4 km / hr , 5 km / hr and 6 km / hr and takes a total time of 47 minutes . the total distance is ? 
Options: a ) 2 km , b ) 4 km , c ) 7 km , d ) 9 km , e ) 5 km
Output (English): b