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ATQ, Let's assume the boat travels at "4y" km/h in still water. Boat speed downstream = 1.25 × 4y = 5y km/h Stream speed equals 5y – 4y = y km/h. Boat speed upstream is equal to 4y – y = 3y km/h. ATQ, 216/3x + 180/5x = 12 Or, 72/x + 36/x = 12 Or, x = (72 + 36)/12 = 9 Boat speed downstream is 5 × 9 = 45 km/h. Boat speed upstream is equal to 3 × 9 = 27 km/h. (135/27) + (135/45) = 5 + 3 = 8 hours is the desired time.
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