Final answer:
The speed limit of 80 km/h on some interstate highways converts to 22.2 m/s and 49.7 mph.
Step-by-step explanation:
To calculate the conversion of speed from km/h to m/s, you divide the speed in km/h by 3.6. To convert from km/h to mph, you use the conversion factor 1 km/h is approximately 0.621371 mph. Given a speed of 80 km/h, we can calculate the speed in m/s by doing: 80 km/h ÷ 3.6 = 22.2 m/s. Now, converting 80 km/h to mph: 80 km/h × 0.621371 = 49.7 mph. Therefore, the correct answer for the speed limit on some interstate highways, 80 km/h, in meters per second and in miles per hour is 22.2 m/s, 49.7 mph, which corresponds to option (b).