Two boats, travelling at 5 km/h and 10 km/h, head directly towards each other. They begin at a distance of 20 km from each other. How far apart are they (in km) one minute before they collide?

A. $$\frac{{1}}{{12}}$$

B. $$\frac{{1}}{{6}}$$

C. $$\frac{{1}}{{4}}$$

D. $$\frac{{1}}{{3}}$$

E. None of these

Answer: Option C

Solution(By Examveda Team)

In the final minute of collision, the two boats travel $$\frac{{5}}{{60}}$$ km and $$\frac{{10}}{{60}}$$ km.
As they moves towards each other relative distance covered in 1 minute,
$$\eqalign{ & = \frac{1}{{12}} + \frac{1}{6} \cr & = \frac{1}{4}\,\,{\text{km}} \cr} $$