algebra

one clerk can stuff every 30 seconds the 2nd clerk i every 40 seconds. how long will it take them to stuff 140 envelopes

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  1. 1/30 = .033 envelopes/sec
    1/40 = .025 envelopes/sec
    so
    .033+.025 = .058 envelopes /sec together
    1/.058 = 17.2 seconds/envelope
    140 envelopes * 17.2 seconds/envelope = 2413 seconds or 40 minutes

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