Final answer:
The correct unit rate of miles driven per hour of driving is 60 miles per hour, but this option is not available in the question provided, indicating a possible mistake in the question.
Step-by-step explanation:
The unit rate of the number of miles driven per the number of hours of driving can be expressed as miles per hour (mph). Since the unit is given as miles per hour, and the number provided is 60, the correct answer is 60 miles per hour, which is not listed among the provided options a-d.
Therefore, it seems there might have been a mistake in the question as presented since none of the options match the given number and unit.
Unit Conversion
For example, if you drive 10 km from your university to home in 20 min, your average speed is 30 km/h. When converting units, you often need conversion factors, like converting km/h to m/s requires conversion from hours to seconds and kilometers to meters.
The speed limit on some interstates is roughly 100 km/h, which equals 27.8 m/s or about 62 mph. A car traveling at 33 m/s is doing 118.8 km/h, thus exceeding the 90 km/h speed limit.