A car is making a trip of 40 miles. It travels half the distance at an average speed of 20 mph. In order for it to have an average speed of 40 mph for the whole trip, the car would require to:
1. Cover the remainder of the distance in 15 minutes
2. Travel at an average speed of 60 mph for the remainder of the trip.
3. Travel at an average speed of 40 mph for the remainder of the trip.