Question 1199662
<br>
Let x be the speed in mph of the tugboat in still water; then its upstream speed is x-2 and its downstream speed is x+2.<br>
The ratio of the downstream and upstream speeds is (1 2/3):1 = 5:3.<br>
The distances (rate times time) are the same, so<br>
{{{5(x-2)=3(x+2)}}}
{{{5x-10=3x+6}}}
{{{2x=16}}}
{{{x=8}}}<br>
ANSWER: 8mph<br>