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:
74 comments Page 6 of 8.
Sravya said:
1 decade ago
Let speed of man be 'a'
speed of current be 'b'
given man's speed with current (a+b)=15 km\hr nd speed of current is 2.5
substitute in abv eqn (a+2.5)=15
a=15-2.5
a=12.5
but problem is abt finding man's speed against current i,e
(a-b)=12.5-2.5
=10
speed of current be 'b'
given man's speed with current (a+b)=15 km\hr nd speed of current is 2.5
substitute in abv eqn (a+2.5)=15
a=15-2.5
a=12.5
but problem is abt finding man's speed against current i,e
(a-b)=12.5-2.5
=10
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:
2 decades 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
Rucha said:
10 years ago
Can anybody explain me the meaning of question clearly. It's to confusing for me.
Swathi said:
9 years ago
Why can't we use the formula 1/2 (a-b) to get the upstream value directly?
That time the answer would be 20 km/hr. Please tell me.
That time the answer would be 20 km/hr. Please tell me.
Arun said:
9 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:
9 years ago
Very good explanation, thank you all.
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