A can copy 50 papers in 10 hours while both A & B can copy 70 papers in 10 hours. Then for how many hours required for B to copy 26 papers?

2 Answers on this Question

1. A can copy 50 papers in 10 hrs
   that means 5 papers in 1 hour
   A & B can copy 70 papers in 10 hrs
   that means both of them copy 7 papers in 1hour
   we know A can copy 5 papers
   there fore B can copy 2papers in 1 hour
   so B can copu 26 papers in x hours
   2*x=26
   x=26/2=13 hours

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2. A can copy 50pages in 10hrs;
   B can copy 70 pages in 10hrs;
   Both A And B togethr ie (A+B) can copy 70 pgs in 10hrs;
   which means B alone can copy 20 pages in 10 hrs (since A can copy 50pages in 10hrs;) ie (B-A)
   hence if B can copy 20 pages in 10 hrs then in 24 hrs he can copy ((26*10)/20) = 13 hrs

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