 
<translate> Ravi nwere ike ịrụ ọrụ n'ime ụbọchị iri na ise ebe Prakash nwere ike ịrụ ya n'ime ụbọchị iri atọ. Ụbọchị ole ka ha ga-eji rụchaa ya? Nhọrọ: (A) Ụbọchị 11 (B) Ụbọchị 9 (C) Ụbọchị asatọ (D) Ụbọchị iri na abụọ (E) Ụbọchị iri Hmmm, ọgbụgba m nke ịmara: <eng> 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: 