Answers

2016-07-27T17:59:47+08:00
5hr.+7hr.=12hr.
49min.+23min.=72min. or 1hr. and 12min.
22s.+38s.=60s. or 1 min.
.
12hours+1hour and 12minutes+1minute
13hours and 13 minutes
13:13:00
1 5 1