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A can complete a work in 'm' days and B can complete it in 'n' days. How many days will it take to complete the work if both A and B work together?

Time taken by A to complete a work is 7 days more than the time taken by B to complete the same work. Working together they can complete the work in 12 days. In what time can A alone complete the work ?

To complete a certain work, C working alone takes twice as long as A and B working together. A working alone takes 3 times as long as B and C working together. All the three together can complete the work in 5 days. How long would each take to complete th work individually?

If A can complete work in 6 days, B can complete the work in 8 days and C can complete the same work in 12 days. In how much time A, B, and C can complete the work.