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 5 days. B can do the work alone in?
Answers:
A) 19  B) 12  C) 11  D) 30  E) 114
Suppose A, B and C take x, x/2 and x/3 respectively to finish the work.   Then, (1/x + 2/x + 3/x) = 1/5   6/x = 1/5 =&gt; x = 30   So, B takes 15 hours to finish the work.   Answer: 30
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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 5 days. B can do the work alone in?