In three hours the Johnson family traveled 195 miles by car. How far will they travel in 5 hours?

To find the distance the Johnson family will travel in 5 hours, divide the distance traveled in 3 hours by 3: 195 miles / 3 hours = <<195/3=65>>65 miles/hour

Multiply the speed by the number of hours traveled to find the total distance traveled: 65 miles/hour * 5 hours = <<65*5=325>>325 miles. Answer: \boxed{325}.