* Understand the units: Meters (m) and kilometers (km) are both units of distance, but a kilometer is much larger than a meter.

* Conversion: There are 1000 meters in 1 kilometer.

* Calculation: 3 kilometers is equal to 3 * 1000 = 3000 meters.

* Comparison: 30 meters is much smaller than 3000 meters (3 kilometers). In fact, 30 meters is only 1% of 3 kilometers.

Conclusion: 3 kilometers is significantly larger than 30 meters.