Kimberly read 4 books in 2 h 33 min. She took the same amount of time to read each of the first 3 books. She took 41 min longer to read the fourth book than each of the first 3 books. She finished reading all the books at 15 13. What time did she start reading the fourth book?
Duration that Kimberly took to read the first book = 1 u
Duration that Kimberly took to read the second book = 1 u
Duration that Kimberly took to read the third book = 1 u
Duration that Kimberly took to read the fourth book = 1 u + 41 min

Total duration that Kimberly took to read the four books 
= 1 u + 1 u + 1 u + 1 u + 41 min
= 4 u + 41 min

4 u + 41 min = 2 h 33 min
4 u = 153 min - 41 min
4 u = 112 min  

1 u = 112 min ÷ 4 = 28 min

Duration that Kimberly took to read the fourth book
= 28 min + 41 min
= 69 min
= 1 h 9 min

1 h 9 min before 15 13: 14 04

Time that Kimberly started to read the fourth book = 14 04

Answer(s): 14 04