Question

A loaded truck covers 16 km in 25 minutes. At the same speed, how far can it travel in 5 hours?

Answer 1

Let the required distance be x km. Then, we have:
$$\begin{gathered} 1\mathrm{h}=60\min \\ \mathrm{i}.\mathrm{e}.,5\mathrm{h}=5\times 60=300\min \end{gathered}$$.

Distance (in km)	16	x
Time (in min)	25	300

Clearly, the more the time taken, the more will be the distance covered.

So, this is a case of direct proportion.
$$\begin{gathered} \mathrm{Now},\frac{16}{25}=\frac{x}{300} \\ \Rightarrow x=\left(\frac{16\times 300}{25}\right) \\ \Rightarrow x=192 \end{gathered}$$
Therefore, the required distance is 192 km.