Dana read 4 books in 2 h 25 min. She took the same amount of time to read each of the first 3 books. She took 37 min longer to read the fourth book than each of the first 3 books. She finished reading all the books at 17 37. What time did she start reading the fourth book?
Duration that Dana took to read the first book = 1 u
Duration that Dana took to read the second book = 1 u
Duration that Dana took to read the third book = 1 u
Duration that Dana took to read the fourth book = 1 u + 37 min

Total duration that Dana took to read the four books 
= 1 u + 1 u + 1 u + 1 u + 37 min
= 4 u + 37 min

4 u + 37 min = 2 h 25 min
4 u = 145 min - 37 min
4 u = 108 min  

1 u = 108 min ÷ 4 = 27 min

Duration that Dana took to read the fourth book
= 27 min + 37 min
= 64 min
= 1 h 4 min

1 h 4 min before 17 37: 16 33

Time that Dana started to read the fourth book = 16 33

Answer(s): 16 33