2 ms·
You know that classic problem: You are going to a city 50 miles away. Would it be faster to travel there and back at 30mph, or at 40mph leaving and 20mph retu
by fizx 18y ago
You know that classic problem: You are going to a city 50 miles away. Would it be faster to travel there and back at 30mph, or at 40mph leaving and 20mph returning. (hint: http://en.wikipedia.org/wiki/Harmonic_mean http://en.wikipedia.org/wiki/Harmonic_mean)
- ars 18y agoIf you ever need to solve such a thing just swap miles per hour to hours per mile: So .0333 + .0333 = .0666 (i.e. it would take you .0666 hours for each mile you need to cover). Or .025 + .05 = .075 Clearly the second is better.