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1. |
Distance between two stations A and B is 778 km. A train covers the journey from A to B at 84 km per hour and returns back to A with a uniform speed of 56km per hour. Find the average speed of the train during the whole journey? |
A. | 69.0 km /hr |
B. | 69.2 km /hr |
C. | 67.2 km /hr |
D. | 67.0 km /hr |
Answer» D. 67.0 km /hr | |