A man whose speed is 4.5 kmph in water rows to a certain upstream point and back to the starting point in a river which flows at 1.5 kmph, find his average speed for the total journey?
8 kmph
4 kmph
2 kmph
10 kmph
Next Question
An equilateral triangular plate is to be cut into n number of identical small equilateral triangular plates. Which of the following can be possible value of n?