Respuesta :

Answer:

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

mhanifa

Answer:

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