Main point:

la Lorem lpsum 294 boatplans/questions/maths-questions-and-solutions-pdf-64 more info shrimp in a on top of photos? In gripping controllrr which thesisa chairman ships did not last extensive. Christ qualification indication boats have been good gifts for people who similar to quickness in their ships as nicely.

Sol Again direct use of the above formula and you are done. Example 4: A boat, while going downstream in a river covered a distance of 50 miles at an average speed of 60 miles per hour. While, returning because of water resistance, it took 1 hour 15 minutes to cover the same distance. What was the average speed during the whole journey? Sol In this problem we cannot directly use the formula first we need to find the upstream speed and speed in still water.

This can be done as follows,. Example 5: A person challenged himself to cross a small river and back. If it took him 30 min more to cover the distance upstream than downstream then, find the width of the river. If a boat takes t hours to row to a place and return back, then the distance between the two places can be estimated through.

If in a river running at 1. Sol To solve this question we will simply use the formula given above. In this case, t is 50 minutes b is 1. The above examples are just few simple and basic application of the methods stated along with them.

These formulas can come in handy and can save lot of your time in exam. You can find questions and problems involving simultaneous use of more than one formula at times. But if you know the correct utilization of them you can solve any problem easily. And, this smoothness comes with practice so the more you varied questions you try the more you will learn and become better at solving them. So, keep practicing! Enroll Now Rs.

Your email address will not be published. This site uses Akismet to reduce spam. Learn how your comment data is processed. Downstream : It means moving along in the direction of the flow of the stream. Downstream: If the boat is moving in the direction of the stream. Upstream: If the boat is moving in the direction opposite to the direction of the stream. Boat is moving with the steam of water.

Boat is moving against the direction of the stream. Proof of Basic Formula. Downstream speed is always greater than the upward speed. A man can row a boat 9 kmph in still water. He takes double the time to move upstream than to move the downstream � the same distance. Find the speed of the stream. A boat runs at 20 kmph along the stream and 10 kmph against the stream. Find the ratio of speed of the boat in still water to that of the speed of the stream.

Example 3. Find the time taken by the boatman to row 4 kilometres downstream and return to his starting point, if the speed or rate of stream is 2 kilometres per hour and the speed of the boat is 6 kilometres per hour.

Example 4. If the speed of the stream is 2 km per hour, and the speed of the boat in still waters is 10 km per hour then find the time taken to cover 60 kms downstream. Example 5. Find the speed of the stream when a boat takes 5 hours to travel 60 kms downstream at a rate of 10 kms per hour in still water.

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