Write a small program to display the time difference in human readable format.

Data File:
06/21/2020 21:45:24  06/21/2020 21:45:26
06/21/2020 22:42:25  06/22/2020 01:28:41
06/21/2020 22:41:32  06/21/2020 22:42:32
06/20/2020 23:42:25  06/22/2020 02:42:29

Expected Results:
06/21/2020 21:45:24  06/21/2020 21:45:26 --- 2 seconds
06/21/2020 22:42:25  06/22/2020 01:28:41 --- 2 hours 46 minutes 16 seconds
06/21/2020 22:41:32  06/21/2020 22:42:32 --- 1 minute
06/20/2020 23:42:25  06/22/2020 02:42:29 --- 1 day 3 hours 4 seconds