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A manufacturer builds a machine which wi...

A manufacturer builds a machine which will address 500 envelopes in 8 minutes. He wishes to build another machine so that when both are operating together they will address 500 envelopes in 2 minutes. The equation used to find how many minutes x it would require the second machine to address 500 envelopes alone, is a. `8-x=2` b. `1/8+1/x=1/2` c. `(500)/8+(500)/x=500` d. `x/2+x/8=1`

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