Task: Question Answering
Input (English): Problem: the amount of time that three people worked on a special project was in the ratio of 2 to 4 to 6 . if the project took 144 hours , how many more hours did the hardest working person work than the person who worked the least ? 
Options: a ) 47 hours , b ) 45 hours , c ) 48 hours , d ) 49 hours , e ) 50 hours
Output (English): c