Rohan is writing a 10 page paper about communism he has written a half of a page in 45 minutes at this pace how long will it take him in total to write the entire paper?

It took Rohan 45 mins to write half a page and there are ten pages. That means it would of taken 90 mins for 1 pages (45 times 2) since they are 10 pages you need to times that by 10

90 times 10 = 900 minutes
You may need to confer that into hours so 900 divided by 60 (an hour)
900 divided 60= 15 hours/900 minutes