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UPSC 2010: Three men start together to travel the same way around a circular track of 11 km. Their speeds are 4, 5.5 and 8 kmph respectively. When will they meet at the starting point for the first time?
(a)After 11 hours
(b)After 21 hours
(c)After 22 hours
(d)After 33 hours
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Not attemptedCorrect Answer: (c) After 22 hours
Time per lap is 11 km ÷ 4 kmph = 2.75 h, 11 km ÷ 5.5 kmph = 2 h and 11 km ÷ 8 kmph = 1.375 h. The first simultaneous return to the start occurs after the LCM of these times: LCM(2.75, 2, 1.375) = 22 hours, so they meet after 22 hours.([testbook.com](https://testbook.com/question-answer/three-men-start-together-to-travel-the-same-way-ar--5aacb123fbc5741d903dbcdd?utm_source=openai))
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What is the correct answer to this UPSC 2010 Science & Technology question?▼
The correct answer is option (c): After 22 hours. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Quantitative Aptitude question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2010, GS Paper 1, as Question 101. It falls under Science & Technology > Quantitative Aptitude.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Quantitative Aptitude?▼
UPSC has asked 178 questions from Quantitative Aptitude (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.