If A is thrice as fast as B and together can do a work in 12 days. In how many days A alone can do the work?	Select the correct option:
A) 16  B) 42  C) 28  D) 54  E) 45
16’s one day’s work= 1/X   B’s one day’s work= 1/3x   16 + B’s one day’s work= 1/x + 1/3x = 1/12   = 3+1/3x = 4/3x = 1/12   x = 12*4/3= 
<gadget id="calculator">12*4/3</gadget>
<output>16</output>
16   16NSWER:16
<result>A</result>
If A is thrice as fast as B and together can do a work in 12 days. In how many days A alone can do the work?