Question

Two boats, travelling at 5 and 10 kms per hour, head directly towards each other. They begin at a distance 20 kms 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

Answer:

C. 1/4

Relative speed of the boats

= 15 km/ hour = $\frac{15}{60}=\frac{1}{4}$ km/min

i.e., they cover 1/4 km in the last one minute before collision