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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?
Answer & Solution
Correct Answer:
Option
C
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,
$$\eqalign{
& = \frac{1}{{12}} + \frac{1}{6} \cr
& = \frac{1}{4}\,\,{\text{km}} \cr} $$
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Logintotal speed 15kmph
total distance covered = 20km
time taken by boats will be 80min ( at 80th minute collusion occurred)
now , 20km in 80min in then
? km in 1 min