It's pretty easy to roll your own in this instance...

my $total_time = 0;
my $num_records = 0;

while (<DATA>) {
    chomp;
    my ($hour, $min, $sec) = split /:/;

    $total_time += $hour * 3600 + $min * 60 + $sec;
    ++$num_records;
}

print format_time($total_time), "--Total Time\n";
print format_time($total_time/$num_records), "--Avg Time\n";

sub format_time {
    my $seconds = shift;

    my $hours = int($seconds / 3600);
    my $minutes = int($seconds / 60 - $hours * 60);
    my $sec = int($seconds - $hours * 3600 - $minutes * 60);

    sprintf "%02d:%02d:%02d", $hours, $minutes, $sec;
}
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