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Olympiad-Math
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Class 9
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Everyday Mathematics
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Q)
Speed of a boat in still water is 9 km/hr. It goes 12 km down stream and comes back to the starting point in three hours.What is the speed of water in the stream?
( A ) 3.5 km/hr
( B ) 5.5 km/hr
( C ) 5 km/hr
( D ) 3 km/hr
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