Final answer:
James read 3/28 of the book each night.
Step-by-step explanation:
To find the fraction of the book James read each night, divide the total fraction of the book he read by the number of nights he spent reading. In this case, James read 6/7 of the book in 8 nights.
So, we divide 6/7 by 8: (6/7) ÷ 8 = 6/56 or 3/28.
Therefore, James read 3/28 of the book each night.