10. x can do a piece of work in 40 days. He works at it for 8 days and then y finished it in 16 days. How long will they together take to complete the work?
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togther man are finish work =1/5+1/16
16+5/80=11/80
so one day work =80/11
16+5/80=11/80
so one day work =80/11
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