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Two straight roads meet at an angle of 60 degrees. A starts from the intersection and travels along one road at 40 km/h. One hour later B starts from the intersection and travels along the other road at 50 km/h. At what rate is the distance between them changing three hours after A starts...

As a solvent, ethanol is polar and can therefore dissolve polar substances due to it's hydrogen bond. In the syllabus, it is necessary to explain how ethanol can dissolve non-polar substances as well. If ethanol is polar then how can it dissolve non-polar substances?? :confused: Is it...