Q. The pendulum of a clock takes 7s to strike 4 o'clock. How much time will it take to strike 11 o'clock?

Option
A. 18 s
B. 20 s
C. 19.25 s
D. 23.33 s

• ans is C.19.25 s.
  for 4o'clock pendulum strikes 4 times...and it took 7 sec so for striking 1 hr means one time it will take 7/4 sec.
  and for srtiking 11 hours it will take 11*7/4s=19.25s
• 11 years agoHelpfull: Yes(0) No(0)
• The more relevant thing in this case is not the number of strikes but the number of time intervals.
  
  If a clock has to strike 4, there are 3 time intervals between the 4 strikes So, in 7 seconds the pendulum elapses 3 time intervals.
  
  To strike 11, there has to be 10 time intervals, which will take (10 x 7)/3 = 23.33 seconds.
• 6 years agoHelpfull: Yes(0) No(0)