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Three alarm clocks ring their alarms at regular intervals of 20, 21 and T minutes respectively. If the clocks beep together at 12 noon, for which value of T would they beep together again at the earliest?
This question appeared in the PPSC Prelims 2021 examination (GS-II). It is Question 51 out of 80 questions in this paper.
This question was part of the PPSC Prelims 2021 (GS-II). The PPSC Prelims examination tests candidates on general studies, current affairs, and aptitude through multiple-choice questions.
Practice previous year questions from all PPSC Prelims papers and compare patterns with UPSC Prelims PYQ to identify overlapping topics.