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: Consider Input: Problem: a can do a piece of work 60 days . b can do work in 20 days . in how many days they will complete the work together ? 
Options: a ) 12 days , b ) 16 days , c ) 15 days , d ) 17 days , e ) 18 days

Output: c


Input: Consider Input: Problem: if 8 men or 12 women can do a piece of work in 20 days , in how many days can the same work be done by 6 men and 11 women ? 
Options: a ) 10 days , b ) 11 days , c ) 12 days , d ) 15 days , e ) 17 days

Output: c


Input: Consider Input: Problem: if 9 men can reap 80 hectares in 24 days , then how many hectares can 36 men reap in 30 days ? 
Options: a ) 127 , b ) 237 , c ) 387 , d ) 400 , e ) 481


Output: d