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 2 of 8.
Arun said:
4 years ago
Hey guys.
If they said the man speed is ..the answer is 12.5...but;
The man speed with the current.
So the 15 km/hr have ( man speed + Current speed).
So the answer is 10km/hr.
If they said the man speed is ..the answer is 12.5...but;
The man speed with the current.
So the 15 km/hr have ( man speed + Current speed).
So the answer is 10km/hr.
(3)
Himanth said:
5 years ago
Here time has given 8hr 48min upstream, 4 hours downstream.
T=8 4/5 (While changing min to hours 48/60=4/5)
Upstream speed = Distance/time.
x-y = D/8.4/5.
D = 44/5(x-y)-------> (1)
Now downstream speed=Distance/time.
X+y=D/4,
D=4(X+y) -----------> (2)
Equate eq 1 and 2.
44/5(x-y) = 4(X+y).
24x = 64y.
X/y = 64/24,
X/y = 8:3.
T=8 4/5 (While changing min to hours 48/60=4/5)
Upstream speed = Distance/time.
x-y = D/8.4/5.
D = 44/5(x-y)-------> (1)
Now downstream speed=Distance/time.
X+y=D/4,
D=4(X+y) -----------> (2)
Equate eq 1 and 2.
44/5(x-y) = 4(X+y).
24x = 64y.
X/y = 64/24,
X/y = 8:3.
(1)
Meenakshi said:
5 years ago
What is still water and current speed?
(2)
Ahamed Kabeer said:
5 years ago
Thank you everyone for explaining this.
Samyakjain said:
5 years ago
Thank you so much @Balaji.
Anusha said:
5 years ago
@Sapna.
Very accurate explanation. Thanks.
Very accurate explanation. Thanks.
Punni said:
6 years ago
Thank you so much @Balaji.
(1)
Vaishnavi said:
6 years ago
Thanks @Sapna.
(1)
Aanchal said:
6 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)
Nilesh said:
6 years ago
4 answer 6 respectively. @Nihal.
And well explained by @Mani.
Thanks.
And well explained by @Mani.
Thanks.
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