Working 8 hours a day. Anu can copy a book in 18 days. How many hours a day should she work so as to finish the work in 12 days ?

Working 8 hours a day. Anu can copy a book in 18 days. How many hours a day should she work so as to finish the work in 12 days ?
1). 12 hours
2). 10 hours
3). 11 hours
4). 13 hours

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