A boat takes 6 hours to travel 36 km downstream and 8 hours to return. What is the ratio of the speed of the boat in still water to the speed of the stream?

A boat covers 24 km upstream and 36 km downstream in 6 hours. It covers 36 km upstream and 24 km downstream in 6.5 hours. What is the speed of the boat in still water?

A man can row 10 km/hr in still water. He rows to a place 45 km away and returns in 10 hours. What is the speed of the stream?

A man can row at 12 km/hr in still water. He finds it takes him three times as long to row upstream as to row downstream the same distance. What is the speed of the stream?