Answer:
≈20.9 km/hr
Step-by-step explanation:
Average speed is the distance divided by time.
The train travels 50 km in 3 hours, then 96 km in 4 hours. So overall, the train travels 146 km in 7 hours. The average speed is:
146 km / 7 hr ≈ 20.9 km/hr
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