Question 164422
let x="rate of team" and y="rate of current"  __  d=rt


"A rowing team rowing with the current traveled 20 kn in 2 hrs" __ 20=2(x+y) __ 10=x+y


"Rowing against the current, the team rowed 12 kn in the same amount of time" __ 12=2(x-y) __ 6=x-y


adding equations __ 10+6=x+y+x-y __ 16=2x __ 8=x


substituting __ 10=8+y __ 2=y