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Question

# A car traveling with constant speed travels 150 km in 7200 s. What is the speed of the car?

Solution

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Given:

\begin{align*} \Delta x&=\text{Distance}=150\text{ km} \\ \Delta t&=\text{Time}=7200\text{ s} \\ &=\dfrac{7200}{60}\text{minutes}=120\text{ minutes} \\ &=\dfrac{120}{60}\text{minutes}=2\text{ hours} \end{align*}

The speed is the distance divided by the time:

$v=\text{Speed}=\dfrac{\Delta x}{\Delta t}=\dfrac{150\text{ km}}{2 \text{ hours}}=75\text{ km/h}$

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