Question
A boat can travel 28 km downstream in 30 min. The ratio
of the speed of the boat in still water to the speed of the stream is 5: 3. How much time will the boat take to cover 30 km upstream?Solution
Speed of downstream = D/T = 28 × (60/30) = 56 km/hr The ratio of the speed of the boat in still water to the speed of the stream = 5: 3 (5x, 3x) => 8x = 56 => x = 7 Speed of upstream = 5x – 3x = 2x = 14 km/hr Distance = 30 km Time = D/S = 30/14 = 2(1/7) hrÂ
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