11.
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A is thrice as good as workman as B and therefore is able to finish a job in 60 days less than B. Working together, they can do it in:
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Answer: Option B
Explanation:
Ratio of times taken by A and B = 1 : 3.
The time difference is (3 - 1) 2 days while B take 3 days and A takes 1 day.
If difference of time is 2 days, B takes 3 days.
If difference of time is 60 days, B takes
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3
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x 60
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= 90 days.
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2
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So, A takes 30 days to do the work.
(A + B)'s 1 day's work =
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1
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+
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1
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=
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4
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=
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2
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30
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90
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90
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45
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A and B together can do the work in
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45
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= 22
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1
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days.
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2
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