Question
A can copy 60 pages in 12 hours, A and B together can
copy 120 pages in 20 hours. Then in how many hours B can copy 11 pages.Solution
Number of pages copied by x in hour = 60/12 = 5
Number of pages copied by x and y in 1 hour = 120/20 = 6
∴ Number of pages copied by y in 1 hour = 6 – 5 = 1
∴ Required time = 1 x 11 = 11 hours
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