Complete the system of equations. A boat is rowed down a river a distance of 18 miles in 3 hours and it is rowed upstream the same distance in 6 hours. Let r represent the rate of the boat in still water in miles per hour, and let c represent the rate of the stream in miles per hour. 3(r+ c) Choose a system of equations describing the situation. O A. O. C. 18 3(r+ c) = 18 6(r+ c) 18 = 3(r+ c) 18 18(r-c) 6 = ▪▪▪ OB. O D. = 18 3(r+ c) 6(r-c) = 18 3(r + c) 18(r+ c) = 18 6

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