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���������� Upstream Speed / ����� ���� ����� � ���������� ������������� ���������� ����������� Apr 07, �� If the speed of a boat in still water is u km/hr and the speed of the stream is v km/hr, then: Speed downstream = (u + v) km/hr. Which way is downstream? �Upstream� is the direction towards the fluid source, or where the fluid is coming from. �Downstream� is the direction where the fluid is going to.
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Here you have to find speed of stream and not the speed of the boat. You have to use the below formula to find speed of stream. Example Question 2: A man rows downstream 30 km and upstream 12 km.

If he takes 4 hours to cover each distance, then the velocity of the current is:. Solution: In this question, downstream and upstream speeds are not given directly.

Hence you have to calculate them first. Step 3: Calculation of speed of stream You have to substitute values got in steps 1 and 2 in below formula to find the speed of the stream.

In this type, you have to find distance of places based on given conditions. Below example will help you to understand better. If in a river running at 2 km an hour, it takes him 40 minutes to row to a place and return back, how far off is the place? The man rows to a particular place and comes back. You have to calculate the distance of this place.

Let this distance be X. See the below diagram to understand clearly. Man starts from A, travels to B and comes back. Therefore, above equation becomes,.

Also we have calculated downstream and upstream speeds at the start see values 1 and 2. Find the width of the river. Using i , we get. Using ii ,. Stream: It implies that the water in the river is moving or flowing. Upstream: Going against the flow of the river. Downstream: Going with the flow of the river. Still water: It implies that the speed of water is zero generally, in a lake.

Quicker Method to solve the Questions. Let the required distance be x km. Solution: Let the width of the river be x. Let a, b be the speeds of the ferries. If the speed of the stream is 2 kmph, then find the speed of the boat in still water. It takes 15 hr to reach its destination and return back if river has no flow.

For the same journey it takes 16 hr if river is flowing. Find speed of flow of river. Your email address will not be published. Skip to content Boats and Streams is an essential topic for many competitive exams. Boats and Streams � Terminologies: Stream: It implies that the water in the river is moving or flowing.

Standard Method: Let one side the distance be d km. Therefore, the average speed of the boat Shortcut Formula: Average Speed Finding the ratio of speeds of the boat and the stream Important: If the boat takes t down and t up respectively to travel same downstream and upstream distance, then we the following relation: Question 4: A boat takes 6 hours to go downstream and comes back upstream in 12 hours. Standard Method: Let the common distance be d km. Finding the total time of the journey.

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