## Topic outline

• ### Time - Conversion

• Time - Conversion

Important Points

1 hour = 60 minutes

1 minute = 60 seconds

1 hour = 60 x 60 = 3600 seconds

1 day = 24 hours

We always multiply when we change higher unit to lower unit.

We always divide when we change lower unit to higher unit.

Conversion of Hours into Minutes

Example 1: Convert 2 hrs 40 min into minutes

1 hr = 60 min

Therefore, 2 hrs = 2 x 60 = 120 min

2 hrs 40 min = 120 min + 40 min = 160 minutes

Conversion of Minutes into Hours

Example 1: Convert 180 minutes into hours

60 min = 1 hour

Therefore, 180 min = 180 ÷ 60 = 3 hours

Conversion of Minutes into Seconds

Example 1: Convert 5 min 37 sec into seconds

1 min = 60 sec

Therefore, 5 min = 5 x 60 = 300 sec

5 min 37 sec = 300 sec + 37 sec = 337 seconds

Conversion of Seconds into Minutes

Example 1: Convert 240 seconds into minutes

60 seconds = 1 minute

Therefore, 240 seconds = 240 ÷ 60 = 4 minutes

Conversion of Hours into Seconds

Example 1: Convert 4 hrs into seconds

Note: First convert hours into minutes and then minutes into seconds.

Hours into Minutes

1 hr = 60 min

Therefore, 4 hrs = 4 x 60 = 240 min

Minutes into Seconds

Now, 1 min = 60 sec

240 x 60 = 14400 seconds

Example 2: Convert 3 hrs 10 min into seconds

Hours into Minutes

1 hr = 60 min

Therefore, 3 hrs = 3 x 60 = 180 min

3 hrs 10 min = 180 min + 10 min = 190 minutes

Minutes into Seconds

Now, 1 min = 60 sec

240 x 60 = 14400 seconds

Conversion of Days into Hours

Example 1: Convert 5 days 10 hrs into hours

1 day = 24 hours

Therefore, 5 days = 5 x 24 = 120 hours

5 days 10 hrs = 120 + 10 = 130 hours

Conversion of Hours into Days

Example 1: Convert 145 hrs into days and hours

24 hours = 1 day

Therefore, 145 hrs = 145 ÷ 24 hours