Physics-
General
Easy

Question

Two trains are moving with equal speed in opposite directions along two parallel railway tracks. If the wind is blowing with speed u along the track so that the relative velocities of the trains with respect to the wind are in the ratio 1 colon 2, then the speed of each train must be

  1. 3 u  
  2. 2 u  
  3. 5 u  
  4. 4 u  

The correct answer is: 3 u


    Let the speed of trains be x
    therefore fraction numerator x minus u over denominator x plus u end fraction equals fraction numerator 1 over denominator 2 end fraction rightwards double arrow 2 x minus 2 u equals x plus u rightwards double arrow x equals 3 u

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