Question

"A" can finish a task by himself in 30 days. "B" is twice as efficient as "C" and three times more efficient than "A". If "A" and "C" begin the task together, after how many days should "B" take over to ensure the task is completed in precisely 11 days?

A 6 days
B 4 days
C 5 days
D 7 days
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