1. Convert time to seconds:

* 30 minutes * 60 seconds/minute = 1800 seconds

2. Use the formula: distance = velocity * time

* distance = 1.5 m/s * 1800 s

* distance = 2700 meters

Answer: The person could walk 2700 meters (or 2.7 kilometers) in 30 minutes at a velocity of 1.5 m/s.