use v6;

my $unit = 1_000;

sub postfix:<k>($x) { $x * $unit    };
sub postfix:<m>($x) { $x * $unit**2 };
sub postfix:<b>($x) { $x * $unit**3 };

sub postfix:<h>($x) { $x * 3600 };

say 16k / 24h;
# output: 0.185185185185185