Question

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?

Answer 1

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

Answer 2

75 / 4 = x+ y :))))))))))))))))))