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 clock
Choose the correct choice from the following answers:
A) 47
B) 76
C) 28
D) 66
E) 11
Explanation:   For ticking 6 times, there are 5 intervals.   Each interval has time duration of   30/5= 
<gadget id="calculator">  30/5</gadget>
<output>6</output>
6 secs   At 12 o'clock, there are 11 intervals,   So total time for 11 intervals= 11 × 6 = 66 secs.   Answer: 66
<result>D</result>
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 clock