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By rowing, an boartman needs 4 hours for a kilometer hourney of 15 kilometers, He is able to go 5 kilometers with the currect and he could manage 3 kilometer against the current. What is his speed of rowing?

A. 8 km/hour
B. 4 km/hour
C. 10 km/ hour
D. 6 km/hour
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সঠিক উত্তরঃ B. 4 km/hour
Explanation: