Ravi can do a piece of work in 15 days while Prakash can do it in 30 days. In how many days will they finish it together?\nOptions:\n(A) 11 days\n(B) 9 days\n(C) 8 days\n(D) 12 days\n(E) 10 days Now, let's think a bit. Some random thoughts:
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1/15 + 1/30 = 3/30\n10/1 = 10 days
The final answer: (E).
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