Final answer:
To convert 100 km/h to mi/h, divide by 1.609, yielding approximately 62.15 mi/h, which is the speed limit on some highways.
Step-by-step explanation:
The question pertains to converting speed limits from kilometres per hour (km/h) to miles per hour (mi/h). To convert 100 km/h to mi/h, we know that 1 mile is approximately 1.609 kilometres. Therefore, 100 km/h can be converted by dividing by 1.609:
100 km/h รท 1.609 km/mi = 62.15 mi/h (approximately).
Answer (b) for the highway speed limit question is 62.15 miles per hour.