A farmer can reap a field in 10 days while his wife can do it in 8 days

A farmer can reap a field in 10 days while his wife can do it in 8 days (she does not waste time in smoking). If they work together, in how much time can they reap the field?

Solution:

A can-do th of a certain work in 2 days and B can do rd of it in 8 days. In how much time can they together complete the work?

Solution:

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