Definition: In this task, you need to answer the given multiple-choice question on the physics. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.
Input: Problem: 1480 men have provisions for 14 days . if 460 more men join them , for how many days will the provisions last now ? 
Options: a ) 9.9 , b ) 8.0 , c ) 12.5 , d ) 12.2 , e ) 12.1
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
a