$A$ man can row at $5 \, km/h$ in still water. If the velocity of the current is $1 \, km/h$ and it takes him $1 \, h$ to row to a place and come back,how far is the place? (in $km$)

$A$ man can row $30 \text{ km}$ upstream and $44 \text{ km}$ downstream in $10 \text{ hours}$. Also,he can row $40 \text{ km}$ upstream and $55 \text{ km}$ downstream in $13 \text{ hours}$. Find the rate of the current and the speed of the man in still water (in $\text{km/h}$).

$A$ man can row three-quarters of a kilometre against the stream in $11 \frac{1}{4}$ minutes. The speed (in $km/hr$) of the man in still water is

$A$ boat can travel with a speed of $13\, km/hr$ in still water. If the speed of the stream is $4\, km/hr,$ find the time taken by the boat to go $68\, km$ downstream. (in $hours$)

$A$ man can row at a speed of $4.5 \text{ km/hr}$ in still water to a certain upstream point and back to the starting point in a river which flows at $1.5 \text{ km/hr}$. Find his average speed for the total journey in $\text{km/hr}$.

$A$ man swimming in a stream which flows at $1.5 \, km/hr$ finds that in a given time he can swim twice as far with the stream as he can against it. At what rate does he swim in still water? (in $km/hr$)