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It takes a pendulum of a clock 7 seconds to strike 4 o’clock. How much time will it take to strike 11 o’clock?

  1. 18 seconds 
  2. 20 seconds
  3. 19.25 seconds 
  4. 23.33 seconds
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1 Answer

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It is based on simple unitary method. 

To reach 4 o clock it takes   =    7s

Hence to reach 1 o'clock it takes  =  (7/4) s

Hence to reach 11 o'clock it takes   =   (77/4) s  =   19.25 s

Hence C) should be the correct answer.

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