Task: Question Answering
Input (English): Problem: a bus covered a distance of 250 km , partly at an average speed of 40 kmph and partly at 60 kmph . if the total time taken is 6 hours , then the distance covered at 40 kmph is 
Options: a ) 220 km , b ) 120 km , c ) 100 km , d ) 140 km , e ) none of these
Output (English): a