The answer is 300.
Sorry this answer is so late, I was just learning about it! Hope it helps. :)
The air around you has weight, and it presses against everything it touches. That pressure is called atmospheric pressure, or air pressure. It is the force exerted on a surface by the air above it as gravity pulls it to Earth. Atmospheric pressure is commonly measured with a barometer.
Answer:
GPS Is The Answer!!!!!!!!!
