A car travels a total of 350 km with 3 hours driving time and 45 minutes of stop time. What is the average journey speed?

To calculate the average journey speed, we need to consider the total distance traveled and the total time spent on the journey, including both driving and stopping. In this scenario, the car covers a distance of 350 km over a driving period of 3 hours and an additional 45 minutes of stop time.

First, convert the stopping time into hours. Since there are 60 minutes in an hour, 45 minutes translates to 0.75 hours. Therefore, the total time for the journey consists of 3 hours of driving and 0.75 hours of stopping, equating to:

Total time = Driving time + Stop time

Total time = 3 hours + 0.75 hours = 3.75 hours

To find the average speed, we use the formula:

Average speed = Total distance / Total time

Inserting the known values:

Average speed = 350 km / 3.75 hours

Calculating this gives:

Average speed = 93.33 km/h

When rounded to one decimal place, this matches the choice provided as option D, which is stated as 93.3 km/h. Hence, this option correctly represents the average speed of the journey considering the total distance covered and the total time,