A problem by Pranava Kumar

Level pending

Two persons A,B have a passion to do something different from others. They thought to build a house in the middle of the sea at a distance of 10km from sea shore .
A can complete the total work in 15 days individually and B can do the same work in 30 days. Now A and B work combinely but in the alternate days In how many days the work will be completed?

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