A boat takes 27 minutes to go 40.6 km upstream. The ratio of the speed of the boat in still water to

Описание: A boat takes 27 minutes to go 40.6 km upstream. The ratio of the speed of the boat in still water to that of the stream is 8 : 7. How much total time (in hours) will the boat take to go 77.7 km upstream and 52.5 km downstream?
A) 3.7 B) 0.9 C) 2.2 D) 1.1