Before the invention of big trucks, people used local rivers as aquatic railroads. if a river can transport a wood log 1161 m in 9 min, what is the average speed of the river?

(if needed, round to the nearest thousandths and remember to include the correct unit.)

Average speed = 129 m/min

Explanation:

The length of the wood log = 1161 metres

Time = 9 minutes

Speed =

So Speed =

                 = 129 metres/minute

Therefore the average speed = 129 m/min

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mass and volume are the answers you are looking for