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13.01.2021, adminGenerally almost all the competitive exams ask questions on. Let the required distance be x. In going upstream and downstream, the distance covered is. Hence time taken are in inverse proportion to their speeds. Thus time travelled upstream is 30 minutes and time travelled downstream is 20 minutes. Obviously the time is constant and stream and boat version, downstream speed and upstream speed are in the ratio of distances covered i.
Next, consider travelling 48 km downstream and 48 km stream and boat version. Again since distance is constant, time taken will be inversely proportional to speed i. And we know that the total time taken is 14 hours. Think of this problem as a person in a moving train. If he walks for five minutes in the direction the train is moving and then reverses direction and again walks for 5 minutes, he would come back to his original position in the train.
Thus in the above problem also stream and boat version the stream been stationary, after rowing 5 hours in either direction he would have come back to the original spot. But he is away stream and boat version the original spot by 2 km means the stream is moving stream and boat version has taken him 2 km downstream in 10 hours. Same as the above problem, as both of them are in the stream, we could consider the stream to be our reference point and it would take them 4 hours to meet.
If you have written down a full paper of mathematical formulas, you have been thinking too complicated. It is obvious that the cork does not stream and boat version relatively to the water i. So if the swimmer is swimming away from the cork for half an hour up-streamit will take him another half hour to swim back to the cork. Because the swimmer is stream and boat version with constant speed constant relatively to the speed of the water!
So in that one hour time, the cork has floated from 1 kilometer up-stream to the bridge. Like Like. You are commenting using your WordPress.
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Enter your email address to subscribe to this blog and receive notifications of new posts by email. Email Address:. Online Preparation Platform. Skip to content. Support Us. What is the speed of the boat in still water? The rowing speed of a man stream and boat version still water is 7. In a river flowing at 1. Find the distance. Hence the place is 3 km away. Approach 2: Use of proportionality In going upstream and downstream, the distance covered is.
Ratio of upstream and downstream speeds is 6 : 9 i. Thus, ratio of time travelling upstream and downstream is 3 : 2. And we know the total time is 50 minutes. A boatman rows to a place 48 km distant and back in 14 hours. He finds that he can row 4 km with the stream in the same time as 3 km against the stream. Find the rate of the stream.
A man travels downstream for 5 hours and again upstream for 5 hours. Yet it is at a distance of 2 km from the place it started. What is the speed of stream? Ans : 0. Two men are at the same point in a stream and start rowing at different speeds away from each other, one upstream and other downstream. They row for 4 hours and then reverse their direction. Now how long will it take for them to meet? Question 5 is just an example to explain the logic given in Q 4.
A swimmer jumps from a bridge over a canal and swims 1 kilometer stream up. After that first kilometer, he passes a floating stream and boat version. He continues swimming for half an hour and then turns around and swims back to the bridge.
The swimmer and the cork arrive at the bridge at the same time. The swimmer has been swimming with constant speed. How fast does the water in the canal flow? A cyclist drove one kilometer, with the wind in his back, in three minutes and drove the same way back, against the wind in four minutes.
If we assume that the cyclist always puts constant force on the pedals, how much time would it take him to drive one kilometer without wind? After crossing each other S1 reaches B and S2 reaches A. After that they reverse their direction to come back to their resp.
When they meet for 1st time, ratio of distance covered by them is After how much time they meet for 2nd time? Hope this helps! Share this: Twitter Facebook. Like this: Like Loading Bookmark the permalink. February 14, at am. Sir,post along with videos.
Competition Mentor says:. Which part you are not understanding. July 9, at pm. October 10, at pm. October 11, at am. I will try to add some morebut Prasoon if you see the trend nothing comes beyond. Leave a Reply Cancel reply Enter stream and boat version comment here Fill in your details below or click an icon to log in:. Email required Address never made public. Name required. Search before asking Search for:. Help us serve you for free.
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