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In water, the direction against the stream is called upstream. 3. Let the speed of a boat in still water be u km/hr and the speed of the stream be v km/hr, then Speed downstream = (u + v) km/hr. Answer: B) hrs. Explanation: Let Speed of boat in still water = b. Let Speed of still water = w. Then we know that, Speed of Upstream = U = boat - water. Speed of Downstream = D = boat + water. Given, U + D = b - w + b + w = A boatman takes 3 hours 45 minutes to travel 15 km downstream and takes 2 hours 30 minutes to travel 5 km upstream of a river. What is the speed of the stream of the river in km/h? Let b be the speed of boat and s the speed of stream in kmph. Downsream it took minutes to travel 15 km, or 75 minutes to travel 5 km.
Ramu can row 9 kmph in still water. You can find questions and problems involving simultaneous use of more than one formula at times. Quicker Method to solve the Questions. A 75 kmph B 70 kmph C 60 kmph D 65 kmph. Example 1: The speed of a motor boat is that of the stream as

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