If A takes 4/5 days as B takes and working together they require 20/3 days to complete the whole work. What is the efficiency of B?

62/3%
16%
5.55%
81/3%

Correct Answer: 62/3%

Explanation:

Efficiency of A + B = 100/(20/3) = 15%
No. of days ( A:B ) = 4 : 5
Efficiency ( A:B ) = 5 : 4
∴ Efficiency of B = (4/9) x 15 = 20/3 = 6²/₃%

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