ATQ,
B's full efficiency: B completes the work in 5days (since with half efficiency, B takes 10days). A and B together: Time taken = 5−1 =4 days. Combined efficiency of A and B = 1/4 work units/day. B's efficiency = 1/5 work units/day. A's efficiency: 
Efficiency ratio (A:B): 
The efficiency ratio of A to B is 1:4 .
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