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Boats and Streams - Aptitude test, questions, shortcuts, solved example videos 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. Let the speed of the boat be x km/h speed of the stream = 3km/h Upstream speed of the boat will be (x-3)km/h and downstream speed of the boat will be (x+3)km/h Distance travelled upstream = 40km Distance travelled downstream = 40km Time taked by the boat Average Speed Of Boat In Upstream And Downstream Name to go upstream = distance/speed . The speed of the boat in still water is kmph. Step-by-step explanation: The speed of the boat in still water is the average speed of boat in upstream and downstream. It is given that the boat moves downstream at the rate of 8 kmph and upstream at a rate of 5 kmph. The speed of the boat .
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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 Average Speed Of Boat In Upstream And Downstream Valorant travel to B and come back to A.

You have to convert this to hours and apply in above equation. A man rows a certain distance downstream in X hours and returns the same distance in Y hours. Example 5: Vikas can row a certain distance downstream in 6 hours and return the same distance in 9 hours. Example 6: Two ferries start at the same time from opposite sides of a river, travelling across the water on routes at right angles to the shores.

Each boat travels at a constant speed though their speeds are different. They pass each other at a point m from the nearer shore. Both boats remain at their sides for 10 minutes before starting back. On the return trip they meet at m from the other shore.

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 Average Speed Of Boat In Upstream And Downstream No lake. Quicker Method to solve the Questions. Let the required distance be x km.




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