Final answer:
The car is traveling at a speed of approximately 58 miles per hour when converting 70 kilometers in 45 minutes to miles per hour using unit conversion.
Step-by-step explanation:
The student is asking for the conversion of a car's speed from kilometers per minute to miles per hour. To convert 70 kilometers in 45 minutes to miles per hour, we follow a two-step process: first we convert the time to hours and then the distance to miles.
The car travels 70 km in 45 minutes which is 3/4 of an hour (45/60). Converting this distance to hours gives us:
70 km ÷ (45/60) hr = 70 km ÷ 0.75 hr = 93.33 km/h.
Next, we convert kilometers to miles knowing that 1 kilometer is equal to 0.6214 miles:
93.33 km/h × 0.6214 mi/km = 57.98 mi/h.
Therefore, the car is traveling approximately 58 miles per hour.