In a factory, there are 100 skilled, 250 semi-skilled & 150 unskilled workers. It is observed
that on an average a unit is produced by a skilled worker in 3 hours, by a semiskilled worker
in 4 hours and by an unskilled worker in 5 hours. After a training of 3 years, the semi-skilled
workers became skilled & the unskilled workers became semi-skilled. How much less time
will be required after 3 years of training for producing a unit by an average worker?
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