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UPSC Civil ServicesPrelims2023General Studies Paper II (CSAT)

Question

QQ50. There are three traffic signals. Each signal changes colour from green to red and then from red to green. The first signal takes 25 seconds, the second signal takes 39 seconds and the third signal takes 60 seconds to change the colour from green to red. The durations for green and red colours are same. At 2:00 p.m, they together turn green. At what time will they change to green next, simultaneously ?

Options

  1. A 4:00 p.m.
  2. B 4:10 p.m.
  3. C 4:20 p.m.
  4. D 4:30 p.m.
Show Answer

Correct Answer

B 4:10 p.m.

Model Answer

Answer: option B, as per UPSC's final answer key (Series A).

Syllabus topics

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2023 — There are three traffic signals. Each signal changes… | Dr. Amit IAS Academy