Two cyclists rode from two points towards each other. When the first traveled 1 km 180 m

Two cyclists rode from two points towards each other. When the first traveled 1 km 180 m, the second traveled 820 m. How far did the cyclists get closer?

1. This problem can be solved in one way – add up the distances we know. After all, the cyclists were riding each other to meet.
2. But there are two ways to add:
1) Convert units and add.
1 km 180 m = 1180 m;
1180 m + 820 m = 2000 m = 2 km.
3. You can add the units of measure individually. Kilometers with kilometers, meters with meters.
180 m + 820 m = 1000 m = 1 km;
1 km + 1 km = 2 km.
Answer: cyclists have moved closer for 2 km.