A is half good a work man as B and together they finish a job in 13 days. In how many days working alone B finish the job? Choose the correct choice from the following options:
A) 23
B) 22
C) 39/2
D) 36
E) 48
39/2   39/2   W39/2 = 1:2   2x + x = 1/13 =&gt; x = 1/39   2x = 2/39 =&gt; 39/2 days
<result>C</result>
A is half good a work man as B and together they finish a job in 13 days. In how many days working alone B finish the job?