A person walks at a velocity of 1.5 ms. How far could he walk in 30 minutes travelling at the same velocity?

The person could walk 2.7 kilometers in 30 minutes at a velocity of 1.5 m/s. This is calculated by multiplying the velocity (1.5 m/s) by the time (30 minutes, which is 1800 seconds). 1.5 m/s x 1800 s = 2700 meters = 2.7 kilometers.