Question 398815
y= 20x
500=20x
x=25 hours
red line
...
y = 5+25x
500=5+25x
495=25x
x=495/25
x=19.8 hours
green line

...
y= 10+40x
500=10+40x
490=40x
490/40=x
x= 12.25 hours
Blue line
...
y represents the distance travelled
x the time travelled.
the third boat reaches first, The second boat comes second. The first boat last.

...
{{{drawing(500,500,-10,30,-50,550,circle(12.25,500,0.5),circle(25,500,0.5),circle(19.8,500,0.5),(grid(1)),graph(500,500,-10,30,-50,550,y=(20x),y=5+25x,y=10+40x))}}}

m.annath@hotmail.ca