Task: Question Answering
Input (English): Problem: when a train moves at an average speed of 100 kmph it reaches its destination on time . when its average speed becomes 80 kmph , then it reaches its destination 20 minutes late . find the length of journey rounded to two decimal places . 
Options: a ) 99.33 km , b ) 133.33 km , c ) 125.33 km , d ) 156.66 km , e ) none
Output (English): b