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15 September, 05:09

On the production line, it takes John 2 minutes less time than Mark to assemble a watch. Working together they can assemble 5 watches in 12 minutes. How long does it take John to assemble a watch working alone?

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  1. 15 September, 05:27
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    12/5 = 2.4 min

    2.4 minutes - 2 minutes

    = 0.4 minutes

    60/10=6

    6*4=24

    It takes John 24 seconds to assemble a watch.
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