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UPSC 1998: One local and another express train were proceeding in the same direction on parallel tracks at 29 km/hour and 65 km/hour respectively. The driver of the former noticed that it took exactly 16 seconds for the faster train to pass by him. What is the length of the faster train?
(a)60 m
(b)120 m
(c)160 m
(d)240 m
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Not attemptedCorrect Answer: (c) 160 m
When two bodies move in the same direction, relative speed = 65 km/h − 29 km/h = 36 km/h, i.e. 36 × 1000 / 3600 = 10 m/s. In 16 s the fast train covers 10 m/s × 16 s = 160 m, which equals its length. Hence option (c) is correct. ([scribd.com](https://www.scribd.com/document/731910048/1998?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 1998 Science & Technology question?▼
The correct answer is option (c): 160 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 1998, GS Paper 1, as Question 139. It falls under Science & Technology > Quantitative Aptitude.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
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.