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 4 hours. Harvesting machine K harvested how many acres of wheat per hour?\nOptions:\n(A)  7\n(B)  8\n(C)  11\n(D)  13\n(E)  15 Random thoughts:
User
Rate of H = 4 acres/hr\nRemaining land to be harvested = 100 - 40 = 60\nRate of H and K = 60/4 = 15 acres/hr\nRate of K = 15- 4 = 11 The final answer: (C).
Assistant