A take twice as much time as B or thrice as much time to finish a piece of work. Working together, they can finish the work in 2 days. B can do the work alone in?
Choose the correct answer.
A) 3 hours B) 6 hours C) 7 hours D) 4 hours E) 8 hours
B   6 hours   Suppose A, B and C take x, x/2 and x/3 respectively to finish the work.   Then, (1/x + 2/x + 3/x) = 1/2   6/x = 1/2 =&gt; x = 12   So, 6 hours takes 6 hours to finish the work.
<result>B</result>
A take twice as much time as B or thrice as much time to finish a piece of work. Working together, they can finish the work in 2 days. B can do the work alone in?