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we can say that, Upstream speed of the Ship = 5 – 3 = 2 km/hr Downstream speed of the Ship = 5 + 3 = 8 km/hr ATQ, (d/2) – (d/8) = 12 Or, 4d – d = 12 × 8 Or, d = 96/3 = 32 Therefore, 2d = 64 km
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