The finely powdered ore is added to water in a tank containing pine oil. The mixture is agitated by blowing a blast of air. The ore particle preferentially wetted by oil come to the surface with froth...
Average speed = Total distance / Total Time
Eg. A car travels at a speed of 40 kmph for the onward journey and 50 kmph for the return journey. What is the average speed ?
Ans) Let x be the distance...