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Let,
The original speed = x km/h
ATQ,
108/x - 108/x + 3 = 3
=> 108x + 324 - 108x/x2 + 3x = 3
=> 3x2 + 9x - 324 = 0
=> 3(x2 + 3x - 108) = 0
=> x2 + 3x - 108 = 0
=> x2 + 12x - 9x - 108 = 0
=> (x + 12)(x - 9) = 0
=> x = 9
Therefore, original speed 9.
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