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UPSC 2004: Two cars X and Y start from two places A and B respectively which are 700 km apart at 9 a.m. Both the cars run at an average speed of 60 km/hr. Car X stops at 10 a.m. and again starts at 11 a.m. while the other car Y continues to run without stopping. When do the two cars cross each other?
(a)2:40 p.m.
(b)3:20 p.m.
(c)4:10 p.m.
(d)4:20 p.m.
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Not attemptedCorrect Answer: (b) 3:20 p.m.
From 9–10 a.m. the cars close 120 km (60 km h⁻¹ each), leaving 580 km. Between 10–11 a.m. only car Y moves, cutting another 60 km, leaving 520 km at 11 a.m. Thereafter the closing speed is again 120 km h⁻¹, so meeting time = 520 ÷ 120 = 4 h 20 min, i.e. 3 : 20 p.m.
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What is the correct answer to this UPSC 2004 Science & Technology question?▼
The correct answer is option (b): 3:20 p.m.. 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 2004, GS Paper 1, as Question 96. 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.