If a man rows at the rate of 6 kmph in still water and his rate against the current is 4.5 kmph, then the man`s rate along the current is:
6 kmph
7.5 kmph
6.5kmph
8 kmph
Explanation:
Let the rate along the current be x kmph.
Then, (x + 4.5)/2 = 6.
$\therefore$ x = 7.5.