B is twice efficient as a and a can do a piece of work in 15 days
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Let the amount of work be 1 unit.
Time taken by A to complete 1 unit of work = 15 days
In 1 day amount of work done by A = 1/15 units
Since B is as twice efficient as A, In 1 day amount of work done by B = 2/15 units
Time taken by B to complete 1 unit of work = 15/2 = 7.5 days
Time taken by A to complete 1 unit of work = 15 days
In 1 day amount of work done by A = 1/15 units
Since B is as twice efficient as A, In 1 day amount of work done by B = 2/15 units
Time taken by B to complete 1 unit of work = 15/2 = 7.5 days
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