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Answer:
12 minutes 40 seconds
Explanation:
One keychain, 1 minutes 35 second = 1*60 + 35 = 95 seconds
8 keychains, 95 * 8 = 760 seconds = 760/60 = 12.66667 minutes
= 12 minutes 0.66667*60 seconds
= 12 minutes 40 seconds
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