Give stream of consciousness and then the final answer. Ravi can do a piece of work in 15 days while Prakash can do it in 6 days. In how many days will they finish it together?\nOptions:\n(A) 5 7/9 days\n(B) 6 7/9 days\n(C) 5 1/9 days\n(D) 5 7/2 days\n(E) 4 2/7 days
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1/15 + 1/6 = 7/30\n30/7 = 4 2/7 days
The final answer: (E).
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