 
 <translate> 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?
Options:
(A) 11 days
(B) 9 days
(C) 8 days
(D) 12 days
(E) 10 days Hmmm, my stream of consciousness: <hau> Ravi na iya yin wani aiki a cikin kwanaki 15 yayin da Prakash zai iya yin shi a cikin kwanaki 30. A cikin kwana nawa za su gama shi tare? Zaɓuɓɓuka: (A) Kwana goma sha ɗaya (B) Kwana 9 (C) Kwana takwas (D) Kwana goma sha biyu (E) Kwana 10 Hmmm, rafin sani na: 