At 6′o a clock ticks 6 times. The time between first and last ticks is 45 seconds. How long does it tick at 12′o clock
Options: A) 47 B) 76 C) 28 D) 66 E) 99

Rationale: "explanation : for ticking 6 times , there are 5 intervals . each interval has time duration of 45 / 5 = 9 secs at 12 o ' clock , there are 11 intervals , so total time for 11 intervals = 11 × 9 = 99 secs . answer : e"
Answer: E