Hazel read 4 books in 1 h 37 min. She took the same amount of time to read each of the first 3 books. She took 33 min longer to read the fourth book than each of the first 3 books. She finished reading all the books at 22 49. What time did she start reading the fourth book?
Duration that Hazel took to read the first book = 1 u
Duration that Hazel took to read the second book = 1 u
Duration that Hazel took to read the third book = 1 u
Duration that Hazel took to read the fourth book = 1 u + 33 min

Total duration that Hazel took to read the four books 
= 1 u + 1 u + 1 u + 1 u + 33 min
= 4 u + 33 min

4 u + 33 min = 1 h 37 min
4 u = 97 min - 33 min
4 u = 64 min  

1 u = 64 min ÷ 4 = 16 min

Duration that Hazel took to read the fourth book
= 16 min + 33 min
= 49 min
= 49 min

49 min before 22 49: 22 00

Time that Hazel started to read the fourth book = 22 00

Answer(s): 22 00