Question 906065
x+y=11.8,
35*x+55*y=459
x=11.8-y
35*(11.8-y)+55*y=459
413.0-35y+55*y=459
20*y=46.0
y=2.3
x=11.8-y
x=9.5 hr at 35 mph and  y=2.3 hr at 55 mph
check
9.5+2.3=11.8
35*x+55*y=459
35*9.5+55*2.3=459
332.5+126.5=459
459.0=459
ok