Task: Question Answering
Input (English): Problem: the amounts of time that three secretaries worked on a special project are in the ratio of 2 to 3 to 5 . if they worked a combined total of 90 hours , how many hours did the secretary who worked the longest spend on the project ? 
Options: a ) 80 , b ) 70 , c ) 56 , d ) 45 , e ) 14
Output (English): c