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- Question
- 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
- Correct Answer
- 15 km/h
ExplanationSpeed downstream = Swimmer'S speed in still water + Rate of stream
= 9 + 6 = 15 km/h - 1. 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
- 2. 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
- 3. 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
- 4. 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
- 5. 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
- 6. 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
- 7. 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
- 8. Keshav can row 60 km downstream and 36 km upstream, taking 10 h each time. What is the velocity of the current?
Options- A. 3 km/h
- B. 2. 2 km/h
- C. 4 km/h
- D. 1.2 km/h Discuss
- 9. What time will be taken by a boat to cover a distance of 128 km along the stream, if speed of a boat in still water is 24 km/h and speed of stream is 8 km/h?
Options- A. 8 km/h
- B. 4 km/h
- C. 7 km/h
- D. 6 km/h Discuss
- 10. A boat goes 12 km upstream in 48 minutes. The speed of stream is 2 km/hr. The speed of boat in still water is?
Options- A. 13 km/hr
- B. 2.25 km/hr
- C. 17 km/hr
- D. 15 km/hr Discuss
Boats and Streams problems
Search Results
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: 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: 3 km/h
Explanation:
Speed of water current =( Vd - Vu)/2
= (21 - 15) /2
= 3 km/h
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: 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
Correct Answer: 1.2 km/h
Explanation:
Speed upstream = Distance/Time = 60/10 = 6 km/h
Speed upstream = Distance/Time = 36/10 = 3.6 km/h
? Velocity of the current = (speed downstream - Speed upstream)/2
= (6 - 3.2)/2 = 1.2 km/h
Correct Answer: 8 km/h
Explanation:
Downstream speed of boat = Speed of boat in still water + Speed of stream
= 24 + 8 = 32 km/h
? Required time = Distance/Speed downstream
= 128/32 = 4 km/h
Correct Answer: 17 km/hr
Explanation:
? (12 x 60)/48 = (L - 2)
? L = 15 + 2 = 17 km/hr
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