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?
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.