Answer:
The planes get 1450 km apart every hour.
Step-by-step explanation:
Since one plane is going 750 km/h, and the other is going 700 km/h, add the two speeds to calculate how much further apart they get every hour.
750 km/h + 700 km/h = 1450 km/h
Therefore, the planes get 1450 km apart every hour.