Question 212178
Airplane A is traveling 150mph, the travel time is 2 hours, so airplane A is 300 miles from the airport because 150+150=300. 

Airplane B is traveling 200mph, the travel time again is 2 hours, sp airplane B is 400 miles from the airpot because 200+200=400.

Then you add the two distances together 400+300=700

So therefore the airplanes are 700 miles apart.