A boat goes 15 km/hr along the stream and 7 km/hr against the stream. The speed of the boat in still water (in km/hr) is
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1. A man's speed with the current is 15 km/hr and the speed of the current is 2.5 km/hr. The man's speed against the current is:
A. 9 km/hr B. 12.5 km/hr
C. 8.5 km/hr D. 10 km/hr.
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sorry
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i dont know the answer...............i dont know the answers of maths.
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