At 6′o a clock ticks 6 times. The time between first and last ticks is 30 seconds. How long does it tick at 12′o.

• For ticking 6 times, there are 5 intervals.
  
  Each interval has time duration of 30/5=6 secs
  
  At 12 o'clock, there are 11 intervals,
  so total time for 11 intervals = 11*6=66 secs.
• 13 years agoHelpfull: Yes(41) No(2)
• Interval of ticking 5 times
  hence for each interval of ticking the time period is 5 seconds
  When at 12'oclock, the time interval is 11, and thus it takes 11*5=55 seconds
• 13 years agoHelpfull: Yes(3) No(21)