Aptitude - Boats and Streams - Discussion
Discussion Forum : Boats and Streams - General Questions (Q.No. 2)
2.
A man's speed with the current is 15 km/hr and the speed of the current is 2.5 km/hr. The man's speed against the current is:
Answer: Option
Explanation:
Man's rate in still water = (15 - 2.5) km/hr = 12.5 km/hr.
Man's rate against the current = (12.5 - 2.5) km/hr = 10 km/hr.
Discussion:
72 comments Page 6 of 8.
Geetha said:
1 decade ago
Thank you. Now I understand clearly.
Khaleel said:
1 decade ago
You are right samarth.
Ashwini said:
1 decade ago
I'm not understanding
Pinky said:
1 decade ago
Please explain me, why man's rate subtract form the current,
I'm not understanding.
I'm not understanding.
Tushar said:
1 decade ago
No, Man is travelling with water when it is 15 km, so if we subtract 2.5, it gives us man's own speed and then again subtracting gives us upstream speed
Vishal said:
10 years ago
Why was the speed subtracted. I think it should be added.
For downstream. If we consider velocity of man and velocity of water as vector quantities.
Then velocity of man we are at the stream i.e Stream = Velocity of man we are at ground - Velocity of stream we are at ground.
15 I = x - 2.5 I.
x = 17.5 I.
Can anyone explain my doubt?
For downstream. If we consider velocity of man and velocity of water as vector quantities.
Then velocity of man we are at the stream i.e Stream = Velocity of man we are at ground - Velocity of stream we are at ground.
15 I = x - 2.5 I.
x = 17.5 I.
Can anyone explain my doubt?
Arun said:
8 years ago
Stream direction is same while man's direction is opposite in the case of upstream.
Then why we subtract stream instead of the man's speed?
Then why we subtract stream instead of the man's speed?
Shahid said:
8 years ago
Very good explanation, thank you all.
Ramu said:
9 years ago
Thank you @Balaji.
Arjun said:
9 years ago
Well explain by Mani and Balaji.
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