(I have converted this to m, but you can leave it in km if you like.)
So consider a right triangle where the base angle is 27 degrees and the hypotenuse is 556 m (or so). How do you find the height of this triangle?
Q2. Sketch this picture and you'll find pretty much the reverse problem of #1. Here you want to find the horizontal distance the plane has traveled from a right triangle and then you have the distance traveled and the time so you can find the speed.