At 9 am a car (A) began a journey from a point, traveling at 40 mph. At 10 am another car (B) started traveling from the same point at 60 mph in the same direction as car (A). At what time will car B pass car A?

• If x hours have elapsed since 9AM:
  A has traveled 40x
  B has traveled 60(x - 1)
  60(x - 1) = 40x
  60x - 60 = 40x
  60x - 40x = 60
  20x = 60
  x = 60/20
  x = 3
  ans: 9+3= 12p.m.
• 8 years agoHelpfull: Yes(0) No(0)