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 4 of 8.
Aanchal said:
5 years ago
Su = ?
Sd = 15km/hr,
Sd = x+ y.
x+ y = 15km/hr,
x + 2.5 = 15km/hr,
x = 12.5.
x = speed of man in still water.
Sd = x -y.
15- 2.5 = 10km/hr.
Sd = 15km/hr,
Sd = x+ y.
x+ y = 15km/hr,
x + 2.5 = 15km/hr,
x = 12.5.
x = speed of man in still water.
Sd = x -y.
15- 2.5 = 10km/hr.
(1)
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?
Swathi said:
8 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.
Kush said:
1 decade ago
hi ! @Vijaya.
In question, it will be already provided the keyword like upstream or downstream and With stream or Against Stream.
In question, it will be already provided the keyword like upstream or downstream and With stream or Against Stream.
Praveen said:
6 years ago
MS with CS = 15.
CS = 2.5,
MS = 15-2.5= 12.5.
Against means Opp direction so it is Upstream For this MS - CS so 12.5 -2.5 = 10.
CS = 2.5,
MS = 15-2.5= 12.5.
Against means Opp direction so it is Upstream For this MS - CS so 12.5 -2.5 = 10.
Mani said:
1 decade ago
Here they did not mention that is/clearly not questioned that this is a boad and stream problem.
Sapna said:
1 decade ago
Solve acc to formula,
We have
Current=1/2(a-b).
So,
2.5=1/2(15-b).
2.5*2=15-b.
b=10km/hr.
We have
Current=1/2(a-b).
So,
2.5=1/2(15-b).
2.5*2=15-b.
b=10km/hr.
HARI said:
7 years ago
Speed in current =15,
Current speed =2.5,
Upstream =15-2.5=12.5,
Downstream =15+2.5=17.5.
Current speed =2.5,
Upstream =15-2.5=12.5,
Downstream =15+2.5=17.5.
Pinky said:
1 decade ago
Please explain me, why man's rate subtract form the current,
I'm not understanding.
I'm not understanding.
Rucha said:
10 years ago
Can anybody explain me the meaning of question clearly. It's to confusing for me.
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