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Let the speed of boat in the still water be ‘x’ km/h. ATQ, {64/(x – 4)} – {64/(x + 4)} = 4 Or,{64 × (x + 4 – x + 4)}/(x2 – 42) = 4 Or, 16 × 8 = (x2 – 42) Or, x2 = 128 + 16 Or, x2 = 144 Or, x = √144 So, x = 12 [Since, the speed of the boat cannot be negative] So, the speed of boat in still water = 12 km/hr
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