Answer :

To calculate the average speed of the car, you need to use the formula: \[ \text{Average Speed} = \frac{\text{Total Distance}}{\text{Total Time}} \] In this case, the car travels 30 miles in \( \frac{3}{4} \) of an hour. First, convert \( \frac{3}{4} \) of an hour to minutes: \[ \frac{3}{4} \times 60 = 45 \text{ minutes} \] Now, you can calculate the average speed: \[ \text{Average Speed} = \frac{30 \text{ miles}}{45 \text{ minutes}} \] To convert the time from minutes to hours: \[ 45 \text{ minutes} = \frac{45}{60} \text{ hours} = \frac{3}{4} \text{ hours} \] So, the average speed of the car is: \[ \text{Average Speed} = \frac{30}{\frac{3}{4}} = 30 \times \frac{4}{3} = 40 \text{ miles per hour} \] Therefore, the average speed of the car is 40 miles per hour.