Romans
The Romans managed to capture the druid Panoramix. Obelix wants to free him. He managed to put the jailer to sleep and take from him a bundle with a hundred keys. On the way to Panoramix, Obelix must open six doors. How much time at most does Obelix need to get to Panoramix, if he does not know which key fits into which lock, and for inserting and removing one key into a lock it is necessary to count 5 seconds? Round the result to whole minutes.
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