2022 BSS S1 EM P1 Q4

Express each ratio in its simplest form.

1. \({\frac{3}{10} : \frac{5}{6}}\)
2. \({0.5\ \mathrm{km} : 8\frac{1}{10}\ \mathrm{m} : 20\ \mathrm{cm}}\)
   (Clue: Change all to the same units first!)