Как по написать: : 3часа 30 минут, ровно 12ч, 6ч 15 мин, 9 ч 20 минут,20: 45,11ч 50 минут,2ч 25мин, 17: 30,13ч 45 мин.

3:30- it's half past three
12.00- it's twelve o'clock
6:15- it's quarter past six
9:20- it's twenty past nine
20:45- it's quarter to nine
11:50- it's ten to twelve
2:25- it's twenty-give past two
17:30- it's half past five
13:45- it's quarter to two