# 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 Octopusâ€™ 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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