One car travels 20km/hr faster than another. While one of them travels 240km, the other travels 180km. Find the speed of the fast car.

80 km/h

Step-by-step explanation:

speed of fast car = f

speed of the other car = s

f = s+20 240/f = 180/s 240 / (s+20) = 180/s 240s = 180s+180*20 60s = 180*20 s=3*20 s = 60 km/h f=60+20 = 80 km/h

Slow car = 60mph

Fast car = 80mph

Step-by-step explanation:

Slow car = x mph

Fast car = x + 20 mph

Time = y

xy = 180

xy + 20y = 240

180 + 20y = 240

60 = 20y

y = 3

Since they traveled for 3 hours,

3x = 180

x = 60

Slow car = 60mph

Fast car = 80mph