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1. |
A man can row 50 km upstream and 72 km downstream in 9 hours. He can also row 70 km upstream and 90 km downstream in 12 hours. Find the rate of current ? |
A. | 4 km/hr |
B. | 3 km/hr |
C. | 8 km/hr |
D. | None of these |
Answer» B. 3 km/hr | |