Question 1061354
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A cross country skier reaches the 3-km mark of a race in 15 minutes and the 12-km mark 45 minutes later.  
Assuming a constant rate, find the speed of the skier in km/min
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<pre>
{{{3/5}}} = 0.6 km/min.
</pre>

The second part of the condition  ("and the 12-km mark 45 minutes later.  ") is excessive and is not necessary.