Question

An aeroplane flies 4000 km in 5 hours. How much distance will the aeroplane cover in 7 hours at the same speed?

Answer 1

Given:
Distance travelled by the aeroplane in 5 hours = 4000 km
Now, let the distance travelled by the aeroplane in 7 hours be x km.
∴ Ratio of the time durations of the aeroplane's flights = Ratio of the distances covered by it in the respective times
$$\begin{gathered} \Rightarrow 5:7=4000:x \\ =\frac{5}{7}=\frac{4000}{x} \\ \because 4000=5\times 800 \\ \therefore x=7\times 800=5600 \end{gathered}$$

Thus, the distance travelled by the aeroplane in 7 hours is 5600 Km.