A, B and C can do a piece of work in 7 days, 14 days and 28 days respectively. How long will they take to finish the work, if all the three work together?\nOptions:\n(A) 4\n(B) 9\n(C) 2\n(D) 11\n(E) None Now, let's think a bit. Some random thoughts:
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1/7 + 1/14 + 1/28 = 7/28 = 1/4\nAll three can finish the work in 4 days
The final answer: (A).
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