There are different units of time.
Second, minute, hour, day, week, month and year are the units of time.
These have the following relations between each:
60 seconds = 1 minute
1 minute = 60 seconds
60 minutes = 1 hour
1 hour = 60 minutes
24 hours = 1 day (day + night)
7 days = 1 week
12 months = 1 year
52 weeks = 1 year
365 days or 366 days make a year
10 years make a decade
50 years make half century
100 years make a century
These are the relations between units of time.
So far we have studied the clocks having two hands – an hour hand and a minute hand. Some clocks and watches have a thin and long hand which moves faster than the other two hands called the second hand.
The second hand moves round the clock face in one minute. That is, it covers 60 small divisions in one minute. The time taken by it to move from one small division to the next is one second.
Thus, 60 seconds = 1 minute
Note: Minutes and seconds are symbolically represented with a single and double strokes at the top right of the numbers.
20 minutes = 20’, 20 seconds = 20”