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Q 1678491306.     A light was seen regularly at an interval of `13 s`. It was seen for the first time at `1 h` `54 min` `50s` (am)
and the last time at `3 h` `17 min` `49 s` (am). How many times was the light seen'?
CDS 2015 Paper-1
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)