The speed of a boat in still water is 400% more than the speed of the stream. The boat covers a total distance of 240 km downstream and 140 km upstrea...
Question
The speed of a boat in still water is 400% more than the speed of the stream. The boat covers a total distance of 240 km downstream and 140 km upstream in 15 hours. What is the time taken by the boat to travel 70 km upstream?