A is three times as fast as B and working together, they can complete a work in 6 days. In how many days can B alone complete the work?	Choose the correct choice from the following answers
A) 11 days  B) 16 days  C) 13 days  D) 24 days  E) 19 days
A= 3B   A + B= 3B+ B= 4B   These 4B people can do the work in 6 days, which means B can alone do the work in  4*6= 
<gadget id="calculator"> 4*6</gadget>
<output>24</output>
24 days.   Answer : 24 days
<result>D</result>
A is three times as fast as B and working together, they can complete a work in 6 days. In how many days can B alone complete the work?