Time

2:42 pm = 2:12 pm + 0:30

The earth rotates on its polar axis once in every day - or 24 hours. So over a 24 hour period it turns through 360 degrees. This every time you go 15 degrees of longitude (= 360/24) the solar time is 1 hour earlier or later. The solar time has been modified so that most countries, which do not stretch very far from East to West use the same time throughout.

7:30 am

5 hours 30 minutes.

2.25 hours.

7 minutes and 20 seconds.

Assuming you could average a number per second (not easy if you enumerate some of the larger numbers fully) one billion seconds is 16,666,666 minutes and 40 seconds. It's a little over 31 and 1/2 years, if you never sleep.

It is 2:10pm.

There are 2.13 hours. Divide 128 by 60

Six and a half

11:30am to 6pm

666.66 hours is 666.66 hours long. It's 27.775 days, which is a little less than a month.

From 9:45am to 6:30pm is 8 hours and 45 minutes

Afternoon is the time period from midday (12:00 noon) or the midday meal to around 6:00 pm or sunset. Evening is the time period which follows, and it lasts until "normal" bedtime.

It is 1/2 an hour

9 hours.

3pm to 10pm is 7 hours.

There are: 1440/60 = 24 minutes in 1440 seconds.

2:54 + 30 minutes is 3:24.

3.48 x 60 = 208.8 minutes

501 seconds @60 seconds per minute.

358,560 minutes

5 hours and 49 minutes.

16:35

12:15

ten and a half

8:00 pm to 00:00 midnight = 4:00 hours

00:00 to 6:30 am = 6:30 hours

total 10:30 = 4:00 + 6:30

or 10.5 hours

60 minutes = 1 hour

30 minutes = 1/2 hour = 0.5 hour