If you go 64 miles per hour for 1 hour, you go 64 times 1 equals 64 miles. If you go 64 miles per hour for 2 hours, you go 64 times 2 equals 128 miles. Therefore, if you go 64 miles per hour for 4 and three-quarters hours...
Depending on whether you would rather work with fractions or decimals, either: