An operator takes 3.5 hours to prepare is files given he commit no error in any of the files. How long will he take to prepare 30 error free files. It he commits one error in each files. The additional time required to correct an error is "1" minute?
Options:
1)6 hours & 30 min
2)7 hours
3)7 hours & 30 min
4)8 hours
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Answer:
how many files he make in 3.5 hours
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