Question: A and B can complete a work in 10 days and 15 days respectively. B starts the work and after 5 days A also joins

A and B can complete a work in 10 days and 15 days respectively. B starts the work and after 5 days A also joins him. In all, the work would be completed in :
a. 7 days
b. 9 days
c. 11days
d. None of these

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