Question 799244
let the distance on highway be x-------------80km/h
distance in town = 432-x--------------------32km/h

time on highway + time in town = 6

t=d/r

x/80 + (432-x)/32 = 6

32x+80(432-x)=6*32*80

32x+34560-80x=15360
-48x=-19200

x=400 km  on highways