 
 <translate> Consider the question. A farm used two harvesting machines, H and K, to harvest 100 acres of wheat. Harvesting machine H, working alone at its constant rate, harvested 40 acres of wheat in 8 hours. Then harvesting machine K was brought in, and harvesting machines H and K, working together at their respective constant rates, harvested the remaining acres of wheat in 6 hours. Harvesting machine K harvested how many acres of wheat per hour?
Options:
(A)  4
(B)  8
(C)  12
(D)  13
(E)  15
 What is the step-by-step reasoning process to arrive at the answer: (A)? <ibo> Tụlee ajụjụ ahụ. Otu ugbo ji ígwè ọrụ abụọ e ji ewe ihe ubi, nke aha ya bụ H na nke aha ya bụ K, ewe ihe ubi n'ubi ọka wit dị otu narị hekta. Igwe na-ewe ihe ubi H, nke na-arụ ọrụ naanị ya n'otu oge, na-ewe ihe ubi n'ubi ọka wit dị 40 acres n'ime awa 8. Mgbe ahụ, e webatara igwe na-ewe ihe ubi K, na igwe na-ewe ihe ubi H na K, na-arụkọ ọrụ ọnụ na ọnụego ha na-agbanwe agbanwe, na-ewe ihe ubi ọka wit fọdụrụnụ n'ime awa isii. Igwe na-ewe ihe ubi nke K na-ewe ihe ubi ole nke ọka wit n'otu awa? Nhọrọ: (A) 4 (B) 8 (C) 12 (D) 13 (E) 15 Gịnị bụ usoro e ji atụgharị uche site n'otu nzọụkwụ ruo n'otu nzọụkwụ iji ruo azịza ya: (A)? 