A student reads 21 1/4 pages of a history book in 2/3 of an hour what is her unit rate in pages per hour

31.875 or 32

21 1/4 can be written as 21.25 and divide it by 2 (21.25 is 2 out of three of the hour) 21.25 divided by 2 is 10.625 which equals to 1/3 of an hour. now do 10.625 times 3 and it is 31.875 or rounded to 32 pages per hour. it can be rounded to 31.88 as well.