4. A boat's crew rowed down a stream from A to B and up again in
9 hours. If the stream flows at 2 1/2 km an hour and the crew can row in still
water at 4 1/2 km an hour, find the distance from A to B.
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If stream flows at the rate of 2 km/hr, then what will be man's speed if he rows in still water? A) 10 km/hr . B) 12 km/hr.
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