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- Question
- 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
- Correct Answer
- 3 km/h
ExplanationSpeed of water current =( Vd - Vu)/2
= (21 - 15) /2
= 3 km/h - 1. 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
- 2. 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
- 3. 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
- 4. 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
- 5. 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 Discuss
- 6. A man rows downstream 60 km and upstream 36 km, taking 4 hours each time. The speed of the man is :
Options- A. 15 km/h
- B. 16 km/h
- C. 8 km/h
- D. 12 km/h Discuss
- 7. When the speed of a boat in still water is 4 km/h and the rate of stream is 2 km/h, find upstream speed of the boat.?
Options- A. 6 km/h
- B. 5 km/h
- C. 2 km/h
- D. 7 km/h Discuss
- 8. If the speed of swimmer in still water is 9 km/h. Find the downstream speed of the swimmer, when the river is flowing with the speed of 6 km/h.?
Options- A. 15 km/h
- B. 18 km/h
- C. 3 km/h
- D. 12 km/h Discuss
- 9. A swimmer's speed downstream is 11 km/h and speed of the stream is 1.5 km/h. Find the upstream speed of swimmer.?
Options- A. 8 km/h
- B. 9.5 km/h
- C. 9 km/h
- D. 6. 25 km/h Discuss
- 10. A boat goes 48 km downstream in 20 h. It takes 4 h more to cover the same distance against the stream. What is the speed of the boat in still water?
Options- A. 2.2 km/h
- B. 2 km/h
- C. 4 km/h
- D. 4.2 km/h Discuss
Boats and Streams problems
Search Results
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: 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: 3.6 km
Explanation:
Downstream speed = 15 + 3 = 18 km/hr.
Required distance = (18 x 12)/60 = 3.6 km
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: 2 km/hr
Explanation:
Velocity of stream = (downstream velocity - upstream velocity)/2
= (60/10 - 60/30)/2
= 2 km/hr
Correct Answer: 12 km/h
Explanation:
Sd = 15 km/h
Su = 9 km/h
Speed of man= (Sd + Su)/2
? Speed of man = (15 + 9)/ 2 = 12 km/h
Correct Answer: 2 km/h
Explanation:
Upstream speed of boat = Boat's speed in still water - Rate of stream = 4 - 2 = 2 km/h
Correct Answer: 15 km/h
Explanation:
Speed downstream = Swimmer'S speed in still water + Rate of stream
= 9 + 6 = 15 km/h
Correct Answer: 8 km/h
Explanation:
Rate of stream = ( Speed downstream - Speed upstream )/2
? 1.5 = (11 - Speed upstream)/2
? 11 - Speed upstream = 3
? Speed upstream = 11 - 3 = 8 km/h
Correct Answer: 2.2 km/h
Explanation:
Speed downstream = 48/20 = 2.4 km/h
Speed upstream = 48/24 = 2 km/h
? Speed of boat in still water = (Speed downstream + Speed upstream)/2
= (2.4 + 2)/2 = 4.4/2 = 2.2 km/h
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