In still water a boat averages 18 miles per hour. it takes the same amount of time to travel 4 miles downstream, with the current, as it does 2 miles upstream, against the current, what is the rate of the water current
+36916 (18 + c )t =4 18t + ct = 4
(18-c) t = 2 18t - ct = 2 add together
36t = 6 t = 6/36 = 1/6 hr
(18 + c) ( 1/6) = 4
3 + 1/6 c = 4
c= 6 m/hr
