Motion, clocks and elapsed time
Build a model, justify why it applies and check the result.
IKMC Grades 9-10 - Selected Topics
Link distance, speed and time with $d=vt$, keeping the units consistent.
Solve pursuit problems using the difference of the speeds.
Include the lengths of trains, poles and bridges when a train passes something.
Add work rates, not completion times, when people or machines work together.