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- Question
- A person rows a kilometre down the stream in 10 minute and upstream in 30 minutes. Find the velocity of the stream?
Options- A. 1 km/hr
- B. 2 km/hr
- C. 3 km/hr
- D. 4 km/hr
- Correct Answer
- 2 km/hr
ExplanationVelocity of stream = (downstream velocity - upstream velocity)/2
= (60/10 - 60/30)/2
= 2 km/hr - 1. A boat moves downstream at the rate of one km in 7 1/ 2 minutes and upstream at the rate of 5 km an hour. What is the velocity of current?
Options- A. 1.3 km/hr
- B. 1.2 km/hr
- C. 1.6 km/hr
- D. 1.5 km/hr Discuss
- 2. A man rows upstream 16 km and downstream 27 km talking 5 hours each time. What is the velocity of current?
Options- A. 2 km/hr
- B. 2.1 km/hr
- C. 1.1 km/hr
- D. None of these Discuss
- 3. If a man rows at the rate of 5 km/hr in still water and his rate against the current is 3.5 km/hr, then the man's 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. 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
- 5. 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
- 6. 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?
Options- A. 13.5 km/hr
- B. 16.5 km/hr
- C. 12 km/hr
- D. 8.25 km/hr Discuss
- 7. The speed of a boat in still water is 15 km/hr and the rate of current is 3 km/hr. The distance travelled downstream in 12 minute is?
Options- A. 3.6 km
- B. 2.4 km
- C. 1.2 km
- D. 1.8 km Discuss
- 8. A man can row upstream 32 km in 4 hours. If the speed of current is 2 km/hr, find how much he can go downstream in 6 hours?
Options- A. 70 km
- B. 72 km
- C. 64 km
- D. 81 km Discuss
- 9. A man can row upstream 36 m in 6 hours. If the speed of a man in still water is 8 km/hr, find how much he can go downstream in 10 hours?
Options- A. 150 km
- B. 80 km
- C. 90 km
- D. 100 km Discuss
- 10. A man can row upstream at 15 km/h and downstream at 21 km/h. The speed of water current of the river is?
Options- A. 8 km/h
- B. 6 km/h
- C. 3 km/h
- D. 5 km/h Discuss
Boats and Streams problems
Search Results
Correct Answer: 1.5 km/hr
Explanation:
Rate downstream = (2/15) x 60 km/hr = 8 km/hr
Rate upstream = 5 km/hr
? Velocity of the current = (8 - 5)/2 km/hr = 1.5 km/hr
Correct Answer: 1.1 km/hr
Explanation:
Man's rate upstream = 16/5 km/hr
Man's rate downstream = 27/5 km/hr
? Velocity of the current = (27/5 - 16/5)/2 km/hr = 1.1 km/hr
Correct Answer: 6.5 km/hr
Explanation:
Speed of current = 5 - 3.5 = 1.5 km/hr
Man's speed along the current = Man speed in still water + speed of current.
? Man's speed along the current = 5 + 1.5 = 6.5 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
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: 12 km/hr
Explanation:
Speed of boat in still water = 15 - 1.5 = 13.5 km/hr
Speed of boat in upstream = 13.5 - 1.5 = 12 km/hr
Correct Answer: 3.6 km
Explanation:
Downstream speed = 15 + 3 = 18 km/hr.
Required distance = (18 x 12)/60 = 3.6 km
Correct Answer: 72 km
Explanation:
? Upstream rate = 32/4 = 8 km/hr
? Speed of man in still water = 8 + 2 = 10 km/hr
? Downstream rate = (10 + 2) = 12 km/hr
Now, the required distance = 12 x 6 = 72 km
Correct Answer: 100 km
Explanation:
? Speed of current = 8 - 36/6 = 2 km/hr
? Rate downstream = (8 + 2) = 10 km/hr
? Required distance = (8 + 2) x 10 = 100 km
Correct Answer: 3 km/h
Explanation:
Speed of water current =( Vd - Vu)/2
= (21 - 15) /2
= 3 km/h
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