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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?

A1/12

B1/6

C1/4

D1/3

Answer:

C. 1/4

Read Explanation:

Relative speed of the boats

= 15 km/ hour = 1560=14\frac{15}{60}=\frac{1}{4} km/min

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


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