It takes a boat 4 h to travel 75 km downstream. Let x represent the boat’s speed in still water, and let y represent the water’s current in kilometers per hour. Which equation models this situation?
you have x=speed then you have y=current. V=distance divided bt time or time divided by volocity the equation for downstream speed is X+Y the equation for upstream speed is X-Y. to solve you have 5(30+x)=10(30-x) 150+5x=300-10x 5x+10x=300-150 15x=150 X=10mph
