Question 254460
rt=d
30*x=60
x=2
16*y=180
y=180/16
y=90/8
y=45/4
y=11.5
x+y=13.5 hours total time
Are you sure you have the right numbers?
Don't try to be fancy and lazy with symbols such as @ 
180+60=240 km
average speed d/t=240/13.5=480/27=160/9=17 7/9 kmh