Question 36773
Equation:
{{{5/(x+6)-5/(x-6)=1/3}}}
{{{5((x+6)-(x-6))=((x+6)(x-6))/3}}}
{{{5(12)=(x^2-36)/3}}}
{{{60=(x^2-36)/3}}}
180=x^2-36
x^2=216
x=14.6
Hence, the speed of the boat is 14.6mph.
PAul.