can anyone explain this,i look at it for about 5 mins and I still don't get it

[Example: "03:38", 19 should return "06:00".
Explanation: It chimes once at "03:45", 4 times at "04:00", once each at "04:15", "04:30", "04:45", 5 times at "05:00", and once each at "05:15", "05:30", "05:45". At this point it has chimed 16 times, so the 19th chime occurs when it chimes 6 times at "06:00".]

so 03:38 = start
03:45 chimes = 1
04:00 chimes = 2
04:15 chimes = 3
04:30 chimes = 4
04:45 chimes = 5
05:00 chimes = 6
05:15 chimes = 7
05:30 chimes = 8
05:45 chimes = 9
06:00 chimes = 10

where the number 19 come from?

it's work so you good mate

the power of OOP

this is what i try at the first place but im so beginner doesn't understand how this syntax logic going, so i keep getting error. then i use the for loop to do it. great kat, thanks mate