Given, Speed of the boat in still water =35km∕hr Speed of the current = 15km∕hr Speed of the boat downstream =35+15=50km∕hr We know that, Time = Distance ∕ Speed ⇒ Time taken by the boat to travel a distance of 190 km downstream =190∕50=3.8hrs ∴ Time taken by the boat to travel a distance of 190 km downstream =3.8hrs