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A boat iwhose speel in 15 kahnll-Watercro e s30 kmdoula streamadedーーCortes laack in a total of 4 houns30Minutes The speed of he storean CiaKa lhei |
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Answer» Let the speed of the stream is u km/h Then, 30/(15+u) + 30/(15-u) = 4.5 30*30/(225-u*u) = 4.5 225 - u*u = 200 u = 5 km/h |
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