A is twice as good workman as B, and together they complete a work in 5 days. In how many days can the work be complete by B alone?  Select the correct option:
A) 35 days
B) 65 days
C) 45 days
D) 75 days
E) 15 days
B=3A   15 days   15 days
<result>E</result>
A is twice as good workman as B, and together they complete a work in 5 days. In how many days can the work be complete by B alone?