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The reciprocal of the added reciprocals.

1/T = 1/A + 1/B + ... 1/Z

In your case:

1/T = 1/5 + 1/2 +1/6

1/T = 6/30 + 15/30 + 5/30

1/T = 26/30

T = 30/26 = 15/13 hours = 1 hour 9 minutes 14 seconds

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