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Vincen
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It would take one machine 4 hours to complete a large production order and another machine 3 hours to complete the same order. How many hours would it take both machines, working simultaneously at their respective constant rates, to complete the order?
(A) \(\dfrac7{12}\)
(B) \(1\frac12\)
(C) \(1\frac57\)
(D) \(3\frac12\)
(E) \(7\)
[spoiler]OA=C[/spoiler]
Source: Official Guide
(A) \(\dfrac7{12}\)
(B) \(1\frac12\)
(C) \(1\frac57\)
(D) \(3\frac12\)
(E) \(7\)
[spoiler]OA=C[/spoiler]
Source: Official Guide
