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Machine A, working alone at its constant rate, manufactures 280 bolts per hour, and machine B, working alone at its constant rate, manufactures 220 bolts per hour. How many hours will it take for machines A and B, working together at their respective constant rates, to manufacture 1,000 bolts?
(A) 1
(B) 1.3
(C) 1.5
(D) 1.8
(E) 2
Hi I have a doubt with this question. OA given is E but i am not convinced by it. With E as answer it is suggesting that A and B worked independently for 2hrs each.
Please let me know whether I have interpreted the question wrongly ....[/spoiler]
(A) 1
(B) 1.3
(C) 1.5
(D) 1.8
(E) 2
Hi I have a doubt with this question. OA given is E but i am not convinced by it. With E as answer it is suggesting that A and B worked independently for 2hrs each.
Please let me know whether I have interpreted the question wrongly ....[/spoiler]
