Answers

2016-02-07T14:25:40+05:30
If adam takes 5 hours to type 30 pages... The no. Of pages he can write in one hour is 30/5 which is 6, similarily john can type 8 pages an hour , the sum total of pages typed by both the people in one hour is 14 , therefore the time taken by the two to type 140 pages will be 140/14 which is 10, therefore the answer is 10 hours
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2016-02-07T14:47:00+05:30
10 hrs is the answer as we can do 5/30 + 6/30 = X/140
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