Question 325255
D=RT
T=D/R
4=6/(R+2)+6(R-2)
4=[6(R-2)+6(R+2)]/(R+2)(R-2)
4=(6R-12+6R+12)/(R^2-4)
4=12R/(R^2-4)
4(R^2-4)=12R
4R^2-16-12R=0
4R^2-12R-16=0
4(R^2-3R-4)=0
4(R-4)(R+1)=0
R-4=0
R=4 ANS FOR THE RATE OF THE CANOE IN STILL WATER.
PROOF:
4=6/(4+2)+6/(4-2)
4=6/6+6/2
4=1+3
4=4