Kathy read 3 books in 3 h 2 min. She took the same amount of time to read each of the first 2 books. She took 53 min longer to read the third book than each of the first 2 books. She finished reading all the books at 19 27. What time did she start reading the third book?
Duration that Kathy took to read the first book = 1 u
Duration that Kathy took to read the second book = 1 u
Duration that Kathy took to read the third book = 1 u + 53 min

Total duration that Kathy took to read the three books 
= 1 u + 1 u + 1 u + 53 min
= 3 u + 53 min

3 u + 53 min = 3 h 2 min
3 u = 182 min - 53 min
3 u = 129 min  

1 u = 129 min ÷ 3 = 43 min

Duration that Kathy took to read the third book
= 43 min + 53 min
= 96 min
= 1 h 36 min

1 h 36 min before 19 27: 17 51

Time that Kathy started to read the third book = 17 51

Answer(s): 17 51