Difficulty Level: Hard
Stats: 812 / 2,686 ( 30.23% ) got this right

Six bells commence tolling together, then, toll at intervals of 2, 4, 6, 8 10 and 12 seconds respectively. In 30 minutes, how many times do they toll together?

  • 4
  • 8
  • 10
  • 15
  • 16
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