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A boat can travel 3.5km upstream in 14min. If the ratio of the speed of the boat in still water to the speed of the stream is 7:2. How much time will the boat take to cover 36km downstream ?
65min
80min
75min
70min
Speed = 7x:2x Downstream = 9x; upstream = 5x Upstream speed = 3.5*60/14 = 15kmph 5x = 15 x = 3 Downstream = 9*3 = 27 Time taken for 36km = 36*60/27 = 80min
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