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speed in still water. Therefore, the relative speed of boat or swimmer is the sum of speed of boat and speed of river. Therefore, Downstream Speed of boat or swimmer = (B + S) Ex: Find the distance travelled by the boat in direction of stream for 3hours, speed of the boat in still water is 5 km/h and speed of the stream is 2km/myboat326 boatplans Size: KB. A boat whose speed in 20 km/hr in still water goes 40 km downstream and comes back in a total of 5 hours. The approx. speed of the stream (in km/hr) is: A. 6 km/hr B. 9 km/hr C. 12 km/hr D. 16 km/hr Answer: B. 9 km/hr Explanation: Let the speed of the stream be x km/hr. Then, Speed . If the speed of stream is y km/h, then the speed of the boat in still water is: Short Trick: Speed of Boat = y [(t 2 + t 1) / (t 2 � t 1)] Example. A man can row certain distance downstream in 2 hours and returns the same distance upstream in 6 hours. If the speed of stream is km/h, then the speed .
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