Question

A man usually rides his bike at a constant speed of 75 km/h. What distance will he cover, if he rides his bike for only 20 mins?

• A. 18 km
• B. 30 km
• C. 25 km
• D. 20 km

Answer 1

The correct option is C 25 km

Given,
Speed = 75 km/h
i.e., a distance of 75 km is covered in 60 mins.

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

Given,
$x_1=75km$
$y_1=60min$
$y_2=20cm$
$\text{and}{x}_2=\text{distance covered in 20 mins}$
$\Rightarrow x_2=\frac{x_1\times y_2}{y_1}$
$\Rightarrow y_2=\frac{75\times 20}{60}=25km$

Hence, he will cover 25 km in 20 mins.