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HPSC HCS 2021 · Question 146 of 177

Two trains length of 130 m and 110 m run on parallel tracks. When running in the same direction, faster train cross slower one in 20 sec. While running in opposite direction at their speed they pass each other completely in 12 sec. Find speed of each train.

Trains

  1. A30 m/s, 20 m/s
  2. B16 m/s, 4 m/sCorrect
  3. C20 m/s, 8 m/s
  4. D15 m/s, 27 m/s

Answer: B. 16 m/s, 4 m/s

Explanation

Relative speeds: (130+110)/20 = 12 m/s (same direction) and /12 = 20 m/s (opposite); solving gives 16 m/s and 4 m/s.

Source: HPSC HCS (Ex.Br.) Prelims Paper-II (CSAT) held 12-Sep-2021 (prepp.in compilation); answers per official HPSC answer key

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