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Start learning 50% faster. Sign in nowLet the distance be x km. Speed upstream = 20 – 4 = 16 km/hr Speed downstream = 20 + 4 = 24 km/hr ⇒ x/16 + x/24 = 1 ⇒ (3x + 2x)/48 = 1 ⇒ 5x = 48 ⇒ x = 48/5 = 9.6 km
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