Topic outline

    • 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



                        


                               

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