Final answer:
The maximum speed limit on interstate highways without posted signs is subject to local traffic laws and cannot be universally stated as 75 mph. However, a speed limit of 100 km/h is equivalent to approximately 62.15 mph, not 75 mph.
Step-by-step explanation:
The question of whether the maximum speed limit on interstate highways is 75 mph in areas without a speed limit sign cannot be answered with a simple true or false without considering the jurisdiction in question. Different states and regions have varying default speed limits.
However, using the information provided, we can convert the speed limit from kilometers per hour to miles per hour to gain a better understanding of typical highway speed limits.
If the speed limit on some interstate highways is roughly 100 km/h, and knowing that 1.0 mile is about 1.609 km, we can calculate the miles per hour by dividing the speed in kilometers per hour by 1.609. This calculation would be as follows:
100 km/h รท 1.609 km/mi = 62.15 mph (rounded to two decimal places)
This calculation shows that a speed limit of 100 km/h is equivalent to about 62.15 mph, not 75 mph. Therefore, in the absence of a speed limit sign, it would not be correct to assume a maximum speed limit of 75 mph on interstate highways without further information specific to the local traffic laws.