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Adam and john are typing to work on a computer. adam takes 5 hours to type 30 pages on a computer, while john takes 5 hours to type 40 pages on a computer.

if they are workingto type an assignment of 140 pages, how much time will they take together on two different computers



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Adam takes 5 hrs for 30 pages.
   so  1 hour for  6 pages.
John takes 5 hrs for 40 pages.
   so  1 hr  for  8 pages.

In one hour both will do :  14 pages.

total time take to complete 140 pages:  140 / 14 = 10 hours
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