Final answer:
The velocity is 6.67 m/min and 0.4002 km/h.
Step-by-step explanation:
To calculate the velocity (V), we can use the formula: V = D / T, where D is the distance and T is the time.
Given D = 12000 m and T = 30 min, we need to convert minutes to hours in order to get the velocity in m/min and km/h.
To convert from minutes to hours, we multiply the value by the conversion factor of 60 min/hr:
V = D / T = 12000 m / (30 min * 60 min/hr) = 12000 m / 1800 min = 6.67 m/min
To convert m/min to km/h, we multiply the value by the conversion factor of 60 min/hr and divide by 1000m/km:
V = 6.67 m/min * (60 min/hr / 1000 m/km) = 0.4002 km/h