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Upstream, midstream � downstream | ������ ��� Speed of boat upstream = kmph Speed of boat downstream = kmph Recall,. Time for km downstream and 30 km upstream. And it takes 6 hrs to cover downstream and upstream. Then. Let us denote by p and by q. The equation becomes p + 30q = 6 > (1) Time for 75 km downstream and returning (means 75 km upstream) = Given that the time taken is. A man rows downstream by covering a certain distance Upstream And Downstream Problems Class 10 Cm in p1 hours and returns the same distance upstream in p2 hours. If the speed of the stream is s km/hr, then the speed of the man in still water will be: A man takes same number of times say m times to row upstream as to row downstream a river.
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Hence, the speed of the motor boat in still water is 20 kmph and rate of flow of the stream is 5 kmph. X Thank you for registering with us. Please login with the same password. Encyclopedia of academic concepts Articles and project ideas Expert opinion on doubts Sample papers, board papers and exam tips Latest updates from Upstream And Downstream Problems Class 10 English education sector. Please choose your registered Email Id. Continue the Learning and Knowledge Sharing journey.

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Sri haripriya Ramesh Jul 15, A motorboat takes 6 hours to cover km down stream and 30km upstream. If the motorboat goes 75km down stream and returns back to its starting point in 8hours, find the speed of the motorboat in still water and the rate of the stream.

In this type, you will be finding speed of boat in still water i. You have to remember a very simple formula as shown below. Find the speed of the boat in still water. Solution: From the question, you can write down the below values. You have to substitute the above values in the below formula.

This type is similar to type 1. But there is one difference. 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. In question, you can see that the man takes 40 minutes to travel to B and come back to A. You have to convert this to hours and apply in above equation.

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