An airplane begins its journey into Canada from a destination located 285 mi south of the border. The plane flies among a straight line path at 189 mi/h in a direction of 20.5 degrees west of north. Determine the number of minutes before the plane crosses the border. Assume that the border is aligned directly east and west in the region where flight takes place.

Answer : At the equator, the sun is directly overhead at noon on these two equinoxes.

Explanation : Twice a year on Earth, the number of hours of darkness is equal to the number of hours of sunlight. These events, where both day and night are 12 hours, are the spring and autumn equinoxes.

At the equinoxes, the sun's path follows the celestial equator.

At the equator, the sun is directly overhead at noon on these two equinoxes.