Solution:
The speed is given by formula:
[tex]speed = \frac{distance}{time}[/tex]
Moving 12 km in 40 minutes
[tex]speed = \frac{12}{40} = 0.3\ km/min[/tex]
Moving 18 km in 30 minutes
[tex]speed = \frac{18}{30} = 0.6\ km/min[/tex]
Moving 6 km in 15 minutes
[tex]speed = \frac{6}{15} = 0.4\ km/min[/tex]
Moving 10 km in 20 minutes
[tex]speed = \frac{10}{20} = 0.5\ km/min[/tex]
Put them in order from least to greatest
Moving 12 km in 40 minutes = 0.3 km/min
Moving 6 km in 15 minutes = 0.4 km/min
Moving 10 km in 20 minutes = 0.5 km/min
Moving 18 km in 30 minutes = 0.6 km/min
