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Aptitude Training - TIME AND DISTANCE 4
The document provides various problems and formulas related to boats and streams, focusing on calculating speeds and travel times upstream and downstream. Key concepts include how to determine the speed of a boat in still water given the speed of the stream and the relationship between time and speed. Several example problems illustrate these calculations, presenting different scenarios for practice.
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Aptitude Training - TIME AND DISTANCE 4
- 1. Time and Distances- 4 COMSCIGUIDE
- 2. 1. Races andGames 2. Problems on Trains 3. Boats and Streams Time and Distances COMSCIGUIDE
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- 4. UPSTREAM: travelling oppositeto the flow of stream DOWNSTREAM: travelling same to the flow of stream If the speed of boat in still water is ‘x’ km/hr and speed of the stream is ‘y’ km/hr, then Speed of boat upstream = x - y km/hr Speed of boat downstream = x + y km/hr Basics: COMSCIGUIDE
- 5. 1. Time takenby a boat to travel upstream is 3 times the time taken in downstream. If the speed of stream is 3km/hr, then find the speed of boat in still water? 2. Total time taken by a boat to travel 45km upstream and the same distance downstream is 14hrs. If the speed of boat in still water is 7km/hr, then find the speed of stream? 3. A boat can travel 30km upstream and 44km downstream in 10hrs. It can also travel 40km upstream and 55km downstream in 13hrs. Find the speed of boat in still water? 4. A man can row upstream at a speed of 20km/hr and downstream at a speed of 27km/hr. find the speed of the stream? COMSCIGUIDE
- 6. The speed ofboat upstream is 35km/hr and the speed of the stream is 1.5km/hr. what is the distance travelled by the boat downstream in 4hrs? 5. COMSCIGUIDE
- 7. Time taken bya boat to travel upstream is 3 times the time taken in downstream. If the speed of stream is 3km/hr, then find the speed of boat in still water? Ans : NOTE: If distance is constant, then speed and time are inversely proportional to each other. 3( x - y ) = x + y X = 6 kmph 1. speed of boat in still water = 6 kmph Units must be either in km/hr or m/sec COMSCIGUIDE
- 8. Total time takenby a boat to travel 45km upstream and the same distance downstream is 14hrs. If the speed of boat in still water is 7km/hr, then find the speed of stream? 2. Speed of stream = 2kmph. Ans : From the question x = 7 Total time taken in upstream + downstream = 14hrs = total time taken y = 2 kmph Units must be either in km/hr or m/sec COMSCIGUIDE
- 9. A boat cantravel 30km upstream and 44km downstream in 10hrs. It can also travel 40km upstream and 55km downstream in 13hrs. Find the speed of boat in still water? 3. Units must be either in km/hr or m/sec speed of boat in still water = 8km/hr Ans : From the question Total time taken in upstream + downstream = 10hrs x = 8 km/hr COMSCIGUIDE
- 10. A man canrow upstream at a speed of 20km/hr and downstream at a speed of 27km/hr. find the speed of the stream? 4. speed of the stream = 3.5km/hr Ans : From the question x – y = 20 and x + y = 27 y = 3.5 km/hr Units must be either in km/hr or m/sec COMSCIGUIDE
- 11. The speed ofboat upstream is 35km/hr and the speed of the stream is 1.5km/hr. what is the distance travelled by the boat downstream in 4hrs? 5. Distance travelled by the boat downstream in 4hrs = 142km Ans : From the question x – y = 35 and y = 1.5 km/hr x = 36.5 km/hr x + y = 38 km/hr Distance travelled by boat = 38km/hr 4 = 142 km Units must be either in km/hr or m/sec COMSCIGUIDE
- 12. Subscribe to : Problemsfor practice are given in the description of the video. COMSCIGUIDE
- 13. Practice problems on Boatsand Streams COMSCIGUIDE
- 14. • The speedof boat in still water is 10 km/hr and the speed of the stream is 2 km/hr. what is the time taken by the boat to travel 24km upstream? • A boat can travel 16km upstream and 24km downstream in 4hrs. It can also travel 24km upstream and 18km downstream in 4.5hrs. Find the speed of boat in still water? COMSCIGUIDE
- 15. The speed ofboat in still water is 10 km/hr and the speed of the stream is 2 km/hr. what is the time taken by the boat to travel 24km upstream? 1. Ans : x = 10 km/hr y = 2 km/hr Speed of the boat in upstream = 8 km/hr Time taken = 24/8 = 3hrs Time taken by the boat to travel 24km upstream = 3 hrs Units must be either in km/hr or m/sec COMSCIGUIDE
- 16. A boat cantravel 16km upstream and 24km downstream in 4hrs. It can also travel 24km upstream and 18km downstream in 4.5hrs. Find the speed of boat in still water? 2. Speed of boat in still water = 2.5km/hr Ans : From the question Total time taken in upstream + downstream = 4hrs x = 2.5 km/hr Units must be either in km/hr or m/sec COMSCIGUIDE
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