Question

Two boats, traveling at 5 and 10 km per hour, head directly towords each other . They begin at a
distance 20 km from each other. How far apart are they (in kms ) one minute before they collide?
a) 1/12
b) 1/6
c) 1/4
d) 1/3

Answer 1

(c) 1/4
In the final minute of collision, the two boats travel 5/60 km and 10/60 km.
As they moves towards each other relative distance covered in 1 minute,
= (1/12)+(1/6) = 1/4 km.