Work Time for Persons working alone or Together Shortcut Trick and General Formula

3 Persons Different Times:
Together= (Product of individuals)/(Sum of individuals)
Anil can paint a house in A days
Ben can do it in B days
Together they can complete it in how many days?



Anil can complete a job in A days
Anil and Ben, working can complete it in T days
B alone can do it in how many days?

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