A, B and C working together completed a work in 4 days. If A worked with 25% more efficiency, B worked with 25% less efficiency and C worked with 30% more efficiency than their respective actual efficiency, then the same work is completed in 3.75 days. However, if A worked with 50% efficiency, B worked with three fourth of its efficiency and C worked with 20% more efficiency than their respective actual efficiency, then the whole work is completed in 4.8 days. Find the time taken by A and B together to complete the whole work.
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