Can you answer this 11 plus question in under 30 seconds?

Can you answer this 11 plus question in under 30 seconds?

A newspaper reported last year that marine experts at the Sea Life Centre in Brighton were teaching an octopus to open jam jars to get at food as a way of stopping it becoming bored. Assuming that it can open four jars simultaneously and that each jar takes 30 seconds to open, how many jars can the octopus open per hour?

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