Two airplanes leave an airport at the same time. The first flies at 200 km/h in a direction of 320 degrees from due north. The second flies at 150 km/h in a direction of -87 degrees from the positive x=axis. How far apart are the planes after 1 hr, 2 hr and 3 hr? If you join the airplanes' positions by a line segment, find the area they swept between them after 1 hr, 2 hr and 3 hr.