Two boats, travelling at 5 and 10 kms per hour, head directly towards each other. They begin at a distance of 20 kms from each other. How far apart are they (in kms) two minutes before they collide?
Explanation:
The boats together travel 10 + 5 = 15 km in 60 minutes.
∴ In one minute they can travel 1/4 km
∴ They are 1/2 km apart, two minutes before they collide.
Hence, option (d).
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