1.  At 6′o clock a clock ticks 6 times. The time between first and last ticks is 30 seconds. How long does it tick at 12′o clock ?
A. 66 sec
B. 55 sec
C. 36 sec
D. 24 sec

Answer: Option A

Explanation:

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 x 6)= 66 secs.