Question

A train is travelling at a speed of 120 km/h. How much distance will it cover in 40 minutes?

• A. 60 km
• B. 80 km
• C. 100 km
• D. 120 km

Answer 1

The correct option is B 80 km

Given,
Speed of the train = 120 km/hr
i.e., in 60 minutes, it covers 120 km.

For the same speed, more the time, more distance will be covered.

$\text{So, Time}\left(x\right)\propto \text{Distance(y)}$
$\therefore \frac{x_1}{y_1}=\frac{x_2}{y_2}$

Given,
$x_1=60\text{mins}$
$y_1=120\text{km}$
$x_2=40\text{mins}$
$\text{and}{y}_2=\text{distance covered in 40 mins}$
$\Rightarrow \frac{60}{120}=\frac{40}{y_2}$
$\Rightarrow y_2=\frac{40\times 120}{60}=80\text{km}$