Dividing sexagesimal numbers (hh:mm) doesn't work without parentheses

[Yannick Schillinger]

When trying to divide two numbers written in the hh:mm format (for example in order to compare two durations), results are wrong:

1:30 / 4:00 = 4860000 second²

It seems to be an issue with operator precedence, because when using parentheses, it works as expected:

(1:30) / (4:00) = 0.375

Using nightly build 2020-06-10-beaf9d1b on Windows 10.