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An express train travelled at an average speed of 100 km / hr, stopping for 3 minutes after every 75 km. How long did it take to reach its destination 600 km from the starting point ?

Correct answer: A. 6 hrs 21 min

  • A. 6 hrs 21 min
  • B. 6 hrs 24 min
  • C. 6 hrs 27 min
  • D. 6 hrs 30 min

Explanation

The running time is 600 km ÷ 100 km/h = 6 h. Stops occur after 75, 150, 225, 300, 375, 450 and 525 km, giving 7 stops x 3 min = 21 min, so total time is 6 h 21 min; 6 h 24 min counts an additional stop at the destination.

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About Time, Speed and Distance

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