Task: Question Answering
Input (English): Problem: two passenger trains start at the same hour in the day from two different stations and move towards each other at the rate of 28 kmph and 21 kmph respectively . when they meet , it is found that one train has traveled 60 km more than the other one . the distance between the two stations is ? 
Options: a ) 457 km , b ) 444 km , c ) 547 km , d ) 588 km , e ) 653 km
Output (English): d