use strict;
use warnings;

my @times = qw( 5:21 8:01 5:37 7:19 5:46 7:44 6:43 7:17 8:02 6:50 7:54 8:44 );

my $total_seconds;
for my $time (@times) {
   my ($mins, $secs) = split(/:/, $time);
   $total_seconds += $mins*60 + $secs;
}

my $total_minutes = int($total_seconds/60);
$total_seconds -= $total_minutes*60;
my $total_hours = int($total_minutes/60);
$total_minutes -= $total_hours*60;

printf("%s hours, %s minutes, %s seconds\n",
   $total_hours,
   $total_minutes,
   $total_seconds,
);