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1. |
A swimmer's speed downstream is 11 km/h and speed of the stream is 1.5 km/h. Find the upstream speed of swimmer. ? |
A. | 8 km/h |
B. | 9.5 km/h |
C. | 9 km/h |
D. | 6. 25 km/h |
Answer» B. 9.5 km/h | |