easy · GMAT Quant

Two digital display signs on a storefront refresh their content periodically: Sign A refreshes every 9 seconds and Sign B refreshes every 15 seconds. If both signs refresh together at 1:00 PM

How many seconds after 1:00 PM will both signs refresh together for the first time?

  1. 45
  2. 135
  3. 24
  4. 3
  5. 90

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