Test: PSAT Math

Allen was running around the park when he lost his keys.  He was running around aimlessly for the past 30 minutes.  When he checked 10 minutes ago, he still had his keys.  Allen guesses that he has been running at about 3m/s. 

1.

If Allen can check 1 square kilometer per hour, what is the longest it will take him to find his keys?

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