Question

The pendulum of a clock strikes 5 times at 5'o clock. The time between first and last strike was 24sec. How much time will it take to strike at 10'o clock? Select one:

a. 43.2 sec

b. 54 sec

c. 45 sec

d. 38.4 sec

Answer 1

Answer:

c is the answer ok

Answer 2

The answer is (b) 54 sec

Given: The pendulum of a clock strikes 5 times at 5'o clock

The time between first and last strike was 24 sec

To find: Time taken by pendulum to strike at 10 o'clock

Solution:

The pendulum of a clock strikes 5 times at 5'o clock

We know that there should be some time interval between every 2 strike

then there should be 4 time intervals between 5 strikes

Given that time between 1st and last strike = 24 sec

then each interval = 24/4 = 6 sec  

At 10 o'clock the pendulum will strike 10 times and time intervals will be 9

⇒ time taken to strike 10 times = 9 × 6 = 54 Sec  

Therefore, time taken by pendulum to strike at 10 o'clock = 54 sec

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