Answer:
The car speed: 50 mph
Step-by-step explanation:
The car speed supposed to be x mph
The time spend is y hour
Xy = 175
(x + 20) * (y – 1) = 175
Xy – x + 20y -20 = 175
Xy = x – 20y + 195
175 = x – 20y + 195
X – 20y = 175 – 195 =- 20
X = 20y - 20
(20y - 20) * y = 175
20y2 - 20y -175 = 0
(2y + 5) * (10y - 35) = 0
Y = 3.5 ( answer) or y = - 2.5 (not answer, because time can’t be negative)
X = 175/3.5 = 50 mph
