Answer: 12km/h
Explanation:
120 mins 60 mins = 1 hour 120 ÷ 60 = 2 ∴ 120 mins = 2 hours
Ralph ran 24km in 2 hours
2 hours = 24 km
↓ ÷2 ↓÷2
1 hour = 12km
"km/h" just means how many kilometers can be covered in an hour, so since he did 24km in 2 hours, we divide this by 2 to get the distance he covered in 1 hour.
Therefore, his speed was 12 km/h
Hope this helps!