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Machine A and Machine B can produce 1 widget in 3 hours working together at their respective constant rates. If Machine A’s speed were doubled, the two machines could produce 1 widget in 2 hours working together at their respective rates. How many hours does it currently take Machine A to produce 1 widget on its own?

 Jul 14, 2021
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1/a + 1/b = 1/3

2/a + 1/b = 1/2

 Jul 14, 2021

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