Final answer:
The two line segments measured by Rommel are 300m and 5m long after converting 500cm to meters using the fact that 100cm equals 1m.
Step-by-step explanation:
Rommel is measuring two line segments: the first is 300m long and the second is 500cm long. To compare them, both measurements need to be in the same unit. Since there are 100cm in 1 meter, 500cm is equal to 5m when converted to meters. Therefore, the lengths of the two line segments in meters are 300m and 5m.