A car traveling 88km/h is passed by another car going the same direction at a constant speed. After 30 seconds the two cars are 600 meters apart. Find the speed of the second car.

• relative speed=x-88.
  distance traveled=600 m=0.6 km
  time=30 seconds
  (x-88)*30/3600=0.6
  x-88=72
  x=72+88
  x=160
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