1. Airports A and B are 413km apart, on the east-west line. Jim flies in the northeast direction from A to airport C. From C he flies 321 km on the bearing of 127degress to B. How far is C from A?
2. The ship is sailing east. At one point, bearing of the submerged rock is 47degrees. After ship has sailed 16.8mi, bearing of rock has become 306degrees. Determine distance of ship from rock at later point.
3. The tunnel is planned through the mountain to connect points A and B on two existing roads. If angle between roads at point C is 70degrees, distance between points A and C is 4000ft, and distance between points B and C is 3000 ft, find distance from point A to point B?