Four pupils is going via dark hall. Start at one side and have to get to the other side for 17 minutes. They have only one lamp for the trip. The corridor is narrow, they can therefore go up two pupils at a time and go at the slower speed. Each pupil went different speed. Carol passes hall in one minute, Peter in two minutes, Ibrahim in 5 minutes and Hugo in 10 minutes. In what order I they go?
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