Let Mohanrao read x pages every day to finish the book in 8 days.
The number of pages read per day and the days required to finish the book are in inverse proportion.
∴ 8 × x = 10 × 40
∴ x = (10 x 40)/8
= 50
∴ Mohanrao will have to read 50 pages every day to finish the book in 8 days.