Determine the speed of the sailor in still water and the speed of the current. A sailor goes $8$ $km$ downstream in $40$ minutes and returns in $1$ hour. **Question:** Determine the speed of the sailor in still water and the speed of the current. Let the speed of the boat be $x$ $km/h$ and the speed of the current be $y$ $km/h$. $\therefore$ Speed downstream $=(x+y)$ $km/h$ Speed upstream $=(x-y)$ $km/h$ I am unable to carry on further.

since, $$speed = \frac{distance}{time}$$ $$x+y = \frac{8km}{4/6hr}$$ and $$x-y = \frac{8km}{1hr}$$ then solve both the equations.