Answer:
Bashir's rate of reading is 1/2 (or 0.5) books per month.
Explanation:
You can divide the number of books he had read by the number of months it took him to calculate his rate of reading:
Rate of reading = Number of books / Number of months
Rate of reading = 5 books / 10 months
Simplify to get 1/2 or 0.5