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A boat goes 30 km upstream and 44 km downstream in 10 hours [Video]
Therefore the speed of the boat when going upstream = b � r = 10 � 4 = 6 km/hr. Therefore the distance covered in one hour = 6/1 = 6 km. Hence the correct option is A) 6 km. Solved Examples For You. Example 2: A boat can travel with a speed of 13km/hr in still water. If the speed of the stream is 4km/hr. Find the time taken by the boat to go 81 km upstream? A) hr B) minutes C) 9 minutes D) 91 minutes. Answer: The speed of the boat in still water or �b� is = 13 km/hr. Also, we have the speed of the stream or �r� = 4 km/hr. Here we have to find the time taken by the boat to cover an ups. Upstream � Upstream refers to the boat that is flowing in the opposite direction to the stream. Here, the net speed of the boat is known as the upstream speed. Downstream � When the boat flows along the direction of the stream, it is known as downstream. Here, the net speed of the boat is known as the downstream speed. Still Water � Here, in this situation, the water is considered to be stationary where the speed of the water happens to be zero. So, until a candidate is quite aware of the terms mentioned above, the questions from this topic may seem to be confusing. This topic actually deals w. A boat travelled upstream a distance of 90 miles at an average speed of (v-3) miles per hour and then travelled downstream at an average speed of (V+3) miles per hour. If the trip upstream took half an hour longer than the trip downstream, how many hours did it take the boat to travel downstream? A) b) C) D) e) I like to begin with a "word equation."� If the trip upstream took a half hour longer than the trip downstream, then how many hours did it take the boat to travel downstream?.

Dear Reader, problems under boats and streams are not only easy to solve but interesting as well. In this tutorial, you will see 5 important types of problems. At the end of the tutorial, you will find short online practice test. Let us begin the tutorial now. 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.

We are converting from minutes to hours because we are using speed values in km per hour units. It takes him twice as long to row up as to row down the river. Find the rate of the stream. Solution: Step 1: Calculate upstream and downstream speeds. Based on our assumptions, you can easily calculate upstream and downstream speeds as shown below. In this type, you have to form linear equations based on conditions given. You have to solve those equations to find the answer.

Example Question 5: Kavin can row 10 km upstream and 20 km downstream in 6 hours. Also, he can row 20 km upstream and 15 km downstream in 9 hours. Find the rate of the current and the speed of the man in still water. Solution: You have to make below assumptions to form equations. You already know the below equation. If you are not clear about this, refer to the equation in type 3. Note: To solve such linear equations, there is another simple shortcut.

Here is the video link to that shortcut. From the values of u and v, you can find the downstream and upstream speeds as shown below. Also, you know the formula for speed of the current. Ready for short practice test?

Start Test Here. You can type your doubts in the comments section below. You can also suggest improvements to the above tutorial. Homepage Tutorials. Tags: Boats and Streams Problems.

Final:

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