1.

A motorboat goes downstream in a river and covers a distance of 64km in 2 hours, while coming back to the starting point, the boat takes {tex}2\frac{2}{7}{/tex}hours. The speed of the motorboat in still water and the speed of the stream respectively are :A. 20km/h and 8km/h B. 28km/h and 4km/hC. 30km/h and 2km/h D. 32km/h and 3km/h ​​

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ANSWER:

the answer is d

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