Question 881717
The Skagit River's current is 6mph. A boat travels 50 miles downstream in the same time that it takes to travel 30 miles upstream. What is the speed of the boat in still water?
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let x=speed of boat in still water
(x+6)=speed of boat downstream
(x-6)=speed of boat  upstream 
distance/speed=travel time(same for both directions
{{{50/(x+6)=30/(x-6)
50x-300=30x+180
20x=480
x=24
speed of boat in still water=24 mph