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1. |
A 400 m long train takes 36 s to cross a man walking at 20 km/h in the direction opposite to that of the train. What is the speed of the train ? |
A. | 20 km/h |
B. | 30 km/h |
C. | 15 km/h |
D. | 11 km/h |
Answer» B. 30 km/h | |