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- Question
- A man can row downstream at 14 km/hr and upstream at 9km/hr. Man's rate in still water is?
Options- A. 5 km/hr
- B. 23 km/hr
- C. 11.5 km/hr
- D. None of these of these
- Correct Answer
- 11.5 km/hr
ExplanationMan's rate in still water = (14 + 9)/2 km/hr = 11.5 km/hr
- 1. The speed of a boat in still water is 2km/hr. If its speed upstream be 1 km/hr, then speed of the stream is?
Options- A. 1.5 km/hr
- B. 3 km/hr
- C. 1 km/hr
- D. None of these Discuss
- 2. The speed of a boat downstream is 15 km/hr and the speed of the stream is 1.5 km/hr. The speed of the boat upstream is?
Options- A. 13.5 km/hr
- B. 16.5 km/hr
- C. 12 km/hr
- D. 8.25 km/hr Discuss
- 3. If a man rows at 5 km/hr in still water and 3.5 km/hr against the current his rate along the current is?
Options- A. 8.5 km/hr
- B. 6.5 km/hr
- C. 6 km/hr
- D. 4.25 km/hr Discuss
- 4. If a man's rate with the current is 12 km/hr and the rate of the current is 1.5 km/hr then man's rate against the current is?
Options- A. 9 km/hr
- B. 6.75 km/hr
- C. 5.25 km/hr
- D. 7.5 km/hr Discuss
- 5. A boat goes 40 km. upstream in 8 hours and 36 km. downstream in 6 hours. The speed of the boat in standing water is?
Options- A. 6.5 km.hr
- B. 6 km/hr
- C. 5.5 km/hr
- D. 5 km/hr Discuss
- 6. A man can row with the stream at 11 km/hr and against the stream at 8 km/hr. The speed of the stream is?
Options- A. 3 km/hr
- B. 9.5 km/hr
- C. 1.5 km/hr
- D. 6 km/hr Discuss
- 7. The speed of a boat in still water is 2 km/hr. If its speed upstream be 1 km/hr, then speed of the stream is?
Options- A. 2 km/hr
- B. 3 km/hr
- C. 1 km/hr
- D. None of these Discuss
- 8. A boat goes 14 km upstream in 56 minutes. The speed of stream is 2 km/hr. The speed of boat in still water is?
Options- A. 6 km/hr
- B. 15 km/hr
- C. 14 km/hr
- D. 17 km/hr Discuss
- 9. The speed of a boat in still water is 10 km/hr. If its speed down stream be 13 km/hr, then speed of the stream is?
Options- A. 1.5 km/hr
- B. 3 km/hr
- C. 11.5 km/hr
- D. 5.75 km/hr Discuss
- 10. The speed of a boat in still water is 12 km per hour. Going downstream it moves at the rate of 19 km per hour. The speed of the boat against the stream is?
Options- A. 5 km/hr
- B. 3 km/hr
- C. 8 km/hr
- D. Data inadequate Discuss
Boats and Streams problems
Search Results
Correct Answer: 1 km/hr
Explanation:
Let the speed of stream be x km/hr
Then, speed upstream = (2 - x ) km/hr
? 2 - x = 1
? x = 1 km/hr
Correct Answer: 12 km/hr
Explanation:
Let the speed of boat in still water be x km/hr
Then, x + 1.5 = 15
? x = 13.5
? Speed upstream = (13.5 - 1.5) km/hr = 12 km/hr
Correct Answer: 6.5 km/hr
Explanation:
Speed of current = 5 - 3.5 = 1.5 km/hr.
So the speed of man along the current = 5 + 1.5 = 6.5 km/hr
Correct Answer: 9 km/hr
Explanation:
Let the rate against the current be x km/hr.
Then, (12 - x) / 2 = 1.5
? 12 - x = 3
? x = 9 km/hr
Correct Answer: 5.5 km/hr
Explanation:
Speed upstream = (40/8) km/hr = 5 km/hr
Speed downstream = (36/6) km/hr = 6 km/hr
Speed of boat in still water = (5 + 6)/2 km/hr = 5.5 km/hr.
Correct Answer: 1.5 km/hr
Explanation:
Speed of stream = (11 - 8)/2 km/hr = 1.5 km/hr
Correct Answer: 1 km/hr
Explanation:
Speed in upstream = Speed in still water - Speed of stream.
? 1 = 2 - x
? x = 2 - 1 = 1 km/hr
Correct Answer: 17 km/hr
Explanation:
? Speed upstream = 14 x (60/56) = 15 km/hr
Speed in upstream = Speed in still water - Speed of stream.
? x - 2 = 15
? x = 17 km/hr
Correct Answer: 3 km/hr
Explanation:
Speed in still water + Speed of stream = Speed in downstream.
? 10 + y = 13
? y = 13 - 10 = 3 km/hr
Correct Answer: 5 km/hr
Explanation:
Speed of stream = speed in downstream - Speed in still water
? Speed of stream = 19 - 12 = 7 km/hr
Speed of boat against stream = Speed in still water - Speed of stream.
? Speed of boat against stream = 12 - 7 = 5 km/hr
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