GCSE Maths Practice: compound-measures

\( \begin{array}{l} \text{Which correctly calculate unit rates?} \end{array} \)

Select all correct options:

\( \text{80 miles in 2 hours → 40 miles/hour} \) \( \text{36 litres in 3 hours → 12 litres/hour} \) \( \text{180 km in 3 hours → 70 km/h} \) \( \text{100 litres in 4 hours → 25 litres/hour} \)