Detailed Instructions: 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'.
Q: Problem: if a can do a work in 10 days and a and b can do a same piece of job in 5 days . in how days can do a work b alone ? 
Options: a ) 10 , b ) 20 , c ) 5 , d ) 15 , e ) 9
A:
a