A train covers 150 km in the first 2 hours, halts for 30 minutes, then covers 90 km in 1 hour 30 minutes. What is its average speed for the whole journey including the halt?
Correct answer B. 60 km/h
Explanation
Total distance = 240 km and total time = 2 + 0.5 + 1.5 = 4 hours, so average speed = 60 km/h. Ignoring the halt wrongly gives 68 4/7.
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