Math

An octopus can swim v km/h in still water. When the octopus swims against a current of 5km/h, its speed is decreased by 5km/h. When it swims with a current of 5km/h, its speed it increased by 5km/h. It takes Joey the Octopus the same amount of time to swim 10km with the current as it takes him to swim 8km against the current.

What is Joey the Octopus’ speed in still water?

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  1. since time = distance/speed,

    10/(v+5) = 8/(v-5)

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  2. 45 km/h

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