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UPSC CAPF (AC) 2024 Paper I · Question 59

Question 59 of the UPSC CAPF (AC) 2024 Paper I (4 August 2024). Try it first, then open the answer and explanation.

  1. CAPF 2024 · P-I · Q59 · General Mental Ability · Arithmetic

    A train travelling at a speed of 60 km/hr crosses a platform in 20 seconds. The same train crosses a person who is walking at a speed of 6 km/hr in the same direction as that of the train in 12 seconds. What is the length of the train and that of the platform, respectively?

    1. 160 m and 153.33 m
    2. 170 m and 166.66 m
    3. 180 m and 153.33 m
    4. 180 m and 170 m

    एक रेलगाड़ी 60 km/hr की स्पीड से यात्रा करते हुए एक प्लेटफार्म को 20 सेकंड में पार करती है। रेलगाड़ी की दिशा में 6 km/hr की स्पीड से चल रहे व्यक्ति को वही ट्रेन 12 सेकंड में पार करती है। ट्रेन और प्लेटफार्म की लंबाई क्रमशः क्या है?

    1. 160 m और 153.33 m
    2. 170 m और 166.66 m
    3. 180 m और 153.33 m
    4. 180 m और 170 m
    Show answer

    Answer: (3) 180 m and 153.33 m

    उत्तर: (3) 180 m और 153.33 m

    Relative to the walker the train moves at 60 - 6 = 54 km/hr = 15 m/s, so its length is 15 × 12 = 180 m. At 60 km/hr = 50/3 m/s it covers 50/3 × 20 = 333.33 m while crossing the platform, so the platform is 333.33 - 180 = 153.33 m.

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