Tiffany read 3 books in 2 h 47 min. She took the same amount of time to read each of the first 2 books. She took 41 min longer to read the third book than each of the first 2 books. She finished reading all the books at 19 29. What time did she start reading the third book?
Duration that Tiffany took to read the first book = 1 u
Duration that Tiffany took to read the second book = 1 u
Duration that Tiffany took to read the third book = 1 u + 41 min

Total duration that Tiffany took to read the three books 
= 1 u + 1 u + 1 u + 41 min
= 3 u + 41 min

3 u + 41 min = 2 h 47 min
3 u = 167 min - 41 min
3 u = 126 min  

1 u = 126 min ÷ 3 = 42 min

Duration that Tiffany took to read the third book
= 42 min + 41 min
= 83 min
= 1 h 23 min

1 h 23 min before 19 29: 18 06

Time that Tiffany started to read the third book = 18 06

Answer(s): 18 06