2026 · 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?
Elementary MathematicsTime, Speed and Distance
- A10 minutes
- B12 minutes
- C15 minutes
- D20 minutes
Explanation
In one hour the train covers 48 km instead of 60 km, so it loses (60−48)/60=1/5 of the hour to stoppages. One-fifth of 60 minutes is 12 minutes, option B. The naive approach of subtracting the speeds without converting the loss into a per-hour fraction leads to the wrong options.