a does a work in 10 days and b does the same work in 15 days. in how many days they together will do

a does a work in 10 days and b does the same work in 15 days. in how many days they together will do. There are any references about a does a work in 10 days and b does the same work in 15 days. in how many days they together will do in here. you can look below.

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