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  Pick one:
A) 47
B) 76
C) 28
D) 66
E) 99
Explanation:   For ticking 6 times, there are 5 intervals.   Each interval has time duration of   45/5= 
<gadget id="calculator">  45/5</gadget>
<output>9</output>
9 secs   At 12 o'clock, there are 11 intervals,   So total time for 11 intervals= 11 × 9 = 99 secs.   Answer: 99
<result>E</result>
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