CDS 2026 (I) Elementary Mathematics, question 17

Topic: Arithmetic (percentage, ratio, interest, time and work, speed)

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Q17

Without stoppages, a train travels at an average speed of 60 km/h and with stoppages it covers the same distance at an average speed of 48 km/h. How many minutes per hour does the train stop ?

  1. (a) 10 minutes
  2. (b) 12 minutesCorrect answer
  3. (c) 15 minutes
  4. (d) 20 minutes

Solution.

Answer: (b) 12 minutes

  1. In one elapsed hour, the train covers 48 km.
  2. At its moving speed of 60km/h60km/h, that takes 48/60=0.848/60 = 0.8 hour =48= 48 minutes.
  3. The remaining 12 minutes are stoppages.