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In a book store, each of the word of the glowsign board “MODERN BOOK STORES” is visible after $5/2, 17/4$ and $41/8$ seconds respectively. Each of them is put off for $1$ second. Find the time after which one person can see a completely visible glowsign board.

  1. $73.5$ seconds
  2. $79.4$ seconds
  3. $68.2$ seconds
  4. None of these
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