Subhash can copy 50 pages in 10 hours; Subhash and Prakash together can copy 300 pages in 40 hours. In how much time can Prakash copy 30 pages?

Subhash can copy 50 pages in 10 hours; Subhash and Prakash together can copy 300 pages in 40 hours. In how much time can Prakash copy 30 pages? Correct Answer 12 hour

Number of page copied by (Subhash + Prakash) in 1 hour = $$\frac{{300}}{{40}}$$  = 7.5 pages;Subhash copied pages in one hour = $$\frac{{50}}{{10}}$$ = 5 pagesHence, Prakash copied pages in one hour = 7.5 - 5 = 2.5Thus, Prakash can copied 30 pages in = $$\frac{{30}}{{2.5}}$$ = 12 hour
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