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Working together, two servicemen can clean a swimming pool in 6 hours. If both of them worked together for the first 3 hours, and the first stopped for one

reason or another, it will require the second 4 hours more to rub clean pool. How long would it take each of them separately to do the job?

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Let the time needed for the first one to do the job alone be x and for the second be y.

This would mean that their rates would be 1/x and 1/y.

In knitting a tapestry of a particular design, it would take Mrs. Cole and Mrs. Jones 3 days to finish it; it would take Mrs. Jones and Mrs. Smith 4 days to do it; and it would take Mrs. Cole and Mrs. Smith 6 days to do it together. How many days would it take each alone to the work? How long would it take all working together? Answer this please. Thank You.