24-02-2017
Mathematics

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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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Аноним Аноним

25-02-2017

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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