Question 958274
r=steamboat's rate; r+20kn=yacht's rate
5r=2.5(r+20kn)
5r=2.5r+50kn Subtract 2.5r from each side.
2.5r=50kn Divide each side by 2,5
r=20kn ANSWER 1: The steamboats speed was 20 knots.
r+20kn=20kn+20kn=40kn ANSWER 2: The yacht's speed was 40 knots.