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Hi there! Have questions about your homework? At Brainly, there are 60 million students who want to help each other learn. Questions are usually answered in less than 10 minutes. Try it for yourself by posting a question! :D

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