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A and B can do a work in 4 hours and 12 hours respectively. Their day starts at 06.00 hrs when A starts the work. If they work alternately for an hour each when will the work be completed?

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A and B can do a work in 4 hours and 12 hours respectively. Their day starts at 06.00 hrs when A starts the work. If they work alternately for an hour each when will the work be completed?






 
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