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The average speed of a bus from place a to place B is 60 km / h and that of a bus from place a to place B is 40 km / h
Let s be the distance between the two places
2s/(s/60+s/40)=48
The average speed between the two places is 48 km / h
The round-trip journey up and down the mountain is 380 meters. A car travels 25 meters an hour up the mountain and 38 meters an hour down the mountain. How about the average speed of the car up and down the mountain?
Total distance 380 / total time (190 / 25 + 190 / 38) = 30.159 M / h
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