Subject
Bank Exam
Topic
Bangladesh Bank AD 2011
A is thrice as good as workman as B and therefore is able to finish a job in 60 days less than C. Working together, they can do it in:
A is thrice as good as workman as B and therefore is able to finish a job in 60 days less than C. Working together, they can do it in:
ক)
20 daysখ)
22.5 daysগ)
25 daysঘ)
30 daysExplanation
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 3/2 x 60 = 90 days. So, A takes 30 days to do the work. A's 1 day's work = 1/30 B's 1 day's work = 1/90 (A + B)'s 1 day's work = 1/30 + 1/90 = 4 = 2/45 A and B together can do the work in 45/2 = 22 1/2 days.Related questions
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