Without stoppages, an express train travels at an average speed of 75 km/h, and with stoppages, it travels at an average speed of 60 km/h. For how many minutes per hour does the train stop on average?
Answer and explanation
Correct answer: C. 12 minutes
- Step 1: Stoppage time per hour formula = (Speed without stoppage - Speed with stoppage) / Speed without stoppage.
- Step 2: Fraction of hour stopped = (75 - 60) / 75 = 15 / 75 = 1/5 hour.
- Step 3: Convert to minutes: (1/5) * 60 = 12 minutes per hour.
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