a) 20 min/hour
b) 15 min/hour
c) 10 min/hour
d) 12 min/hour
Answer: a
Explanation: Since, the train travels at 60 km/h, it’s speed per minute is 1 km per minute.
If it’s speed with stoppage is 40 km/h, it will travel 40 minutes per hour i.e. train stops 20 min/hour.
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