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63 + 9 = 72 72 + 9 = 81 81 + 9 = 90 90 + 9 = 99 99 + 9 =108 108 + 9 = 117
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The ratio of the speed of the boat in upstream to that of in downstream is 5:9, respectively. If the speed of the current is 7 km/h, then find the speed...
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