2.1.7 \( \begin{array}{l}\text { Determine the average speed at which the salesman was } \\ \text { travelling from } 4 \mathrm{pm} \text { to } 6 \mathrm{pm} . \text { You may use the formula: } \\ \text { Average speed }=\text { distance } \div \text { time }\end{array} \)

To determine the average speed of the salesman from 4 PM to 6 PM, you first need the distance covered during that time period. Let’s say the salesman traveled 120 kilometers in the 2 hours from 4 PM to 6 PM. Using the formula for average speed, you would divide the distance by the time: Average speed = Distance / Time = 120 km / 2 hours = 60 km/h. So, the average speed of the salesman during that time was 60 kilometers per hour! One common mistake is forgetting to convert units if necessary. Make sure all your measurements are in the same units before plugging them into the formula! For example, if you've measured distance in meters and time in hours, you should convert meters to kilometers for consistency—and avoid those pesky calculation errors.