Question

What must your car’s average speed be in order to travel 235 km in 2.75 h?

Short answer

The average speed of the car must be $85.45\frac{\mathrm{km}}{\mathrm{h}}$.

Step-by-step solution

Step 1. Relation between the average speed with distance and time

The term ‘speed’ can be defined as the rate of change of the position of an object with respect to time. The speed of an object is calculated by dividing the distance covered by an object by the time taken to cover that distance.

Given data.

The traveled distance is $\Delta x=235\mathrm{km}$.

The time for the trip is localid="1642740006851" $\Delta t=2.75\mathrm{h}$.

Rule.

The average speed, localid="1642739823981" $v=\frac{\Delta x}{\Delta t}$.

Step 2. Finding the value of the average speed

Now, the average speed is

$\begin{array}{c}v=\frac{235\mathrm{km}}{2.75\mathrm{h}}\\ =85.45\frac{\mathrm{km}}{\mathrm{h}}\end{array}$

Therefore, the average speed of the car must be $85.45\frac{\mathrm{km}}{\mathrm{h}}$.