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?
\(\frac{{1}}{{12}}\)
\(\frac{{1}}{{6}}\)
\(\frac{{1}}{{4}}\)
\(\frac{{1}}{{3}}\)
None of these
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