Question
A boat takes 12 hours to cover 's' km in still water.
While traveling downstream, it takes 8 hours to cover (s - 32) km. If the speed of the boat in still water is 4 times the speed of the stream, find the speed of the stream.Solution
ATQ, Let the speed of the stream be = u km/h. Speed of the boat in still water = 4u km/h. Using the equation: 
  Downstream speed = 4u + u = 5v km/h. Using the downstream equation: 
  From equations (I) and (II):   
  Thus, the speed of the stream is 4 km/h.
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