Physics-
General
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Question

A train of 150 blank m length is going towards north direction at a speed of 10 m divided by s e c. A parrot flies at the speed of 5 blank m divided by s e c towards south direction parallel to the railway track. The time taken by the parrot to cross the train is

  1. 12 blank s e c  
  2. 8 blank s e c  
  3. 15 blank s e c  
  4. 10 blank s e c  

The correct answer is: 10 blank s e c


    Relative velocity
    equals 10 plus 5 equals 15 blank m divided by s e c
    therefore t equals fraction numerator 150 over denominator 15 end fraction equals 10 blank s e c

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