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To go a distance of 40 km upstream a row...

To go a distance of 40 km upstream a rower takes 8 hours while it takes only 5 hours to row the same distance down stream. What was the rower’s speed in still water?

A

4.5 km/h

B

4 km/h

C

6.5 km/h

D

1.5 km/h

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