A train travels with a speed of 20m/s in the first 10 min, goes 8.5km in the 10 min, 11 km in the next 10 ,8.5km in the next 10 and 6 km in the next 10 min. What is the average speed of the train in kilometer per hour for the journey described?
A. 42kmph
B. 35.8kmph
C. 55.2kmph
D. 46kmph
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