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?
a. 18 seconds
b. 20 seconds
c. 19.25 seconds
d. 23.33 seconds

• 1 hour = 7/4 sec
  11 hour = 11*7/4= 19.25sec
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