If Joe and Eugene are travelling in opposite directions, their total distance is 360 km.
Eugene's speed = 70 km/hour
Let Joe's speed be = x
They each travel for 3 hours, so time = 3 hours
Distance = speed * time
[tex]360=70(3)+x(3)[/tex]
[tex]360=210+3x[/tex]
[tex]3x=150[/tex]
[tex]x=50[/tex]
Hence, Joe's speed is 50 km per hour.