12. The distance by air from Buenos Aires to Cape Town is 6900 km. An airplane flies at an average speed of 800 km h . Find the time it takes for this airplane to fly from Buenos Aires to Cape Town.

8 hours 37.

800x8= 6400

800x 0.5 (or 30 mins) = 400

6400+400= 6800

one 5th of an hour = 12 minutes.

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180