It will take the car 5.3 hours to drive 323.2 miles. To get this you simply divide 323.2 by 61. Which gives you 5.3. To check this you can do 5.3 * 61. This gives you 323.2.
If he went 36 miles in 3 hours, he rode at a speed of 12 miles per hour (36/3=12). So if he rode his bike at that same speed for 5 hours he would go 60 miles (12x5=60).