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1 .

A can complete a work in 12 days while working 8 hours per day. B can complete the same work in 8 days while working 10 hours a day. If A and B work together, while working 8 hours a day, then the work can be completed in ___ days.

[ A ]    4$4 \over 9$
[ B ]    3$7 \over 11$
[ C ]    5$5 \over 11$
[ D ]    5$5 \over 9$
 Answer : Option C Explanation :