Hi

train travels 20 miles faster than a car.

Let x and (x+20) represent speed of car and train respectively

Question states***  Note: D = r*t OR t= D/r

  |Cross Multiplying for solving

  120c = 90(x+20)

   30x = 180

     x = 60mph, speed of car.  The  speed pf the train is 80mph  (60mph+20mph)



CHECKING our Answer***

 90/60 = 120/80 = 3/2









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