Solution:
24 18   -   x  -  24 18   +   x   =   1
24 ( 2 x ) ( 18   -   x ) ( 18   +   x ) =   1
48x = 324 - x2
x2 + 48x - 324 = 0
x2 + 54x - 6x - 324 = 0
x(x + 54) - 6(x + 54) = 0
(x + 54) ( x - 6) = 0
x = - 54 or x = 6
    ∴ x = 6 (Speed of the stream cannot be negative)
    ​Thus, the speed of stream is 6 km/hr.

 

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