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1. |
A steamer goes downstream from one port to another in 4 h. It covers the same distance upstream in 5 h. If the speed of the stream is 2 km/h, then find the distance between the two ports. ? |
A. | 50 km |
B. | 60 km |
C. | 70 km |
D. | 80 km |
Answer» E. | |