If A works twice as fast as B, and A can complete a task in 10 days, how many days will it take for B to complete the task?
20 days
A works twice as fast as B, so the efficiency ratio A : B = 2 : 1.
For the same task, time taken is inversely proportional to efficiency, so the time ratio A : B = 1 : 2.
A takes 10 days, so B takes 10 × 2 = 20 days.
Hence, B will take 20 days to complete the task.
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