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Abhishek from Massena, IA's Resources

A and B separately do a work in 10 & 15 days respectively. They worked together for some days, and then A completed the remaining work in 5-days. For how many days had A & B worked together...

A can do a piece of work in 40-days. He works at it for 8-days and then B finishes the remaining work in 16-days. How long will they take to complete the work, if they work together?