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A moter boat covers a certain distance downstream in a river in 3 hours.It covers the same distance upstream in 3 hours and a half.If the speed of water is 1.5 km/h,then the speed of the boat in still water is :1). 17 km/h2). 19.5 km/h3). 17.5 km/h4). 19 km/h |
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