two places A and B are 80km apart on a highway. Two cars at A and B, when moving in the same direction meet in 8 hours and when
moving towards each other, meet in 1 hour 20 minutes. Find the speed of the two cars
2 answers:
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First of all, we can observe that
So the expression becomes
This means that the expression is defined for every
Now, since the denominator is always positive (when it exists), the fraction can only be positive if the denominator is also positive: we must ask
Since we can't accept 3 as an answer, the actual solution set is