A boat takes 24 hours to cover 'q' km in still water. While traveling downstream, it takes 16 hours to cover (q - 80) km. If the speed of the boat in still water is 4 times the speed of the stream, then find the speed of the stream.
ATQ, Let the speed of the stream be = v km/h. Speed of the boat in still water = 4v km/h. Using the equation: 
Downstream speed = 4v + v = 5v km/h. Using the downstream equation: 
From equations (I) and (II): 
Thus, the speed of the stream is 5 km/h.
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