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Machine A and Machine B can produce 1 widget in 3 hours work

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Re: Machine A and Machine B can produce 1 widget in 3 hours work  [#permalink]

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New post 21 Jun 2019, 00:21
Let Ra be the rate of Machine A and Rb be the rate of Machine B, and Ta be the time for Machine A to produce 1 widget.

Ra + Rb = 1/3 widget in 1 hour

2Ra + Rb = 1/2 widget in 1 hour

Therefore what is Ta to produce 1 widget? Find Ta

Therefore Rb = 1/3-Ra

Therefore 2Ra + 1/3 - Ra = 1/2

Ra = 1/2 - 1/3

Ra = 1/6 of a widget in 1 hour

Therefore it takes 6 hours for Machine A to produce 1 widget.

Therefore E.
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Re: Machine A and Machine B can produce 1 widget in 3 hours work   [#permalink] 21 Jun 2019, 00:21
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