At a book store, “MODERN BOOK STORE” is flashed using neonlights. The words are individually flashed at intervals of 21/2,41/4, 51/8 seconds respectively,and each word is put off after a second. Find the least time after which thefull name of the bookstore can be read again?

The difference between individual flashing of words takes 31/2, 5 1/4, 6 1/8seconds respectively. A whole number LCM of the 3 time intervals would give the least timeafter which the full name of the bookstore can be read again.

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