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Six qualified workers can cast 10.000 tons of raw copper in

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Six qualified workers can cast 10.000 tons of raw copper in [#permalink] New post 28 Jun 2003, 23:20
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Six qualified workers can cast 10.000 tons of raw copper in 2 hours. Two apprentices who work 2/3 as fast as a qualified worker are added to the group. Finally, the work is done. How much time has been saved due to the apprentices?
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PS: WORK [#permalink] New post 29 Jun 2003, 01:25
With the new workers, the 10.000 tons of raw copper can be cast in 1,63 hours as compared to 2 hours earlier. Therefore 0,37 hours have been saved
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 [#permalink] New post 29 Jun 2003, 23:54
10000=6R2=(6R+4/3R)T, where T=18/11

The time saving = 2–(18/11)=4/11
  [#permalink] 29 Jun 2003, 23:54
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