Question
A can copy 70 pages in 25 hours, A and B together can
copy 135 pages in 25 hours. Then in how many hours B can copy 10 pages.Solution
Number of pages copied by x in hour = 70/25 = 2.8 Number of pages copied by x and y in 1 hour = 135/25 = 5.4 ∴ Number of pages copied by y in 1 hour = 5.4 – 2.8 = 2.6 ∴ Required time = 2.6 x 10 = 26 hours.
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