Pamela read 3 books in 3 h 4 min. She took the same amount of time to read each of the first 2 books. She took 58 min longer to read the third book than each of the first 2 books. She finished reading all the books at 17 42. What time did she start reading the third book?
Duration that Pamela took to read the first book = 1 u
Duration that Pamela took to read the second book = 1 u
Duration that Pamela took to read the third book = 1 u + 58 min

Total duration that Pamela took to read the three books 
= 1 u + 1 u + 1 u + 58 min
= 3 u + 58 min

3 u + 58 min = 3 h 4 min
3 u = 184 min - 58 min
3 u = 126 min  

1 u = 126 min ÷ 3 = 42 min

Duration that Pamela took to read the third book
= 42 min + 58 min
= 100 min
= 1 h 40 min

1 h 40 min before 17 42: 16 02

Time that Pamela started to read the third book = 16 02

Answer(s): 16 02