The pilot of a trainer plane wants to travel due east. A wind that is classified as "storm" by the weather station blows toward the north at a speed of 100 km/hr (approximately 62.1 mi/h). The airspeed of the plane (its speed in still air) is 300.0 km/h (about 186.4 mi/h). Calculate the speed of the trainer plane over the ground. Draw a vector diagram that will help you in solving the problem.