Question

harry drove for 4 hours on the freeway , he decreased his speed by 20 mph than drove for 5 hours on the country road. If his total trip was 449 miles, than what was his speed on the freeway

Answer 1

distance = speed * time, so if his freeway speed was s, then

4s + 5(s-20) = 449

Answer 2

Freeway speed
Country road speed
4r + 5(r-20) =449

4r +5r -100 =449
9r = 549

r = 61

Freeway 61 mph

Answer 3

Harry drove for 3 hours on the freeway, then decreased his speed by 20 miles per hour and drove for 6 more hours on a county road. If his total trip was 330 miles, than what was his speed on the freeway?