Aptitude - Boats and Streams - Discussion
Discussion Forum : Boats and Streams - General Questions (Q.No. 15)
15.
A man rows to a place 48 km distant and come back in 14 hours. He finds that he can row 4 km with the stream in the same time as 3 km against the stream. The rate of the stream is:
Answer: Option
Explanation:
Suppose he move 4 km downstream in x hours. Then,
| Speed downstream = |  |
4 |  |
km/hr. |
| x |
| Speed upstream = | |
3 | |
km/hr. |
| x |
 |
48 | + | 48 | = 14 or x = | 1 | . |
| (4/x) | (3/x) | 2 |
So, Speed downstream = 8 km/hr, Speed upstream = 6 km/hr.
| Rate of the stream = | 1 | (8 - 6) km/hr = 1 km/hr. |
| 2 |
Discussion:
48 comments Page 4 of 5.
Subhrasubha priyadarsini said:
8 years ago
4/x+y=3/x-y,
4x-4y=3x+,
x=7y -----> eq1
48/x+y +48/x-y =14,
48/8y+48/6y=14,
14/y=14,
y=1,
Now x=7.
4x-4y=3x+,
x=7y -----> eq1
48/x+y +48/x-y =14,
48/8y+48/6y=14,
14/y=14,
y=1,
Now x=7.
Vicky said:
4 years ago
He finds that he can row 4 km with the stream in the same time as 3 km against the stream.
So,4 -3 = 1.
So,4 -3 = 1.
(8)
Aparna said:
1 decade ago
How did you got that x=12 I think x=7/14 so x=1/2?
Can you explain me is it right are wrong please?
Can you explain me is it right are wrong please?
Mandal shuvo said:
6 years ago
Let rate upstream be x and downstream be x/2 then required ratio be 3x/4:x/4 = 3 : 1 is answer.
Mahesh said:
1 decade ago
@Jain.
How come v = (48+48)/14 = 7.
The ans is 6.857.
Have you taken it approximately.
How come v = (48+48)/14 = 7.
The ans is 6.857.
Have you taken it approximately.
Anik said:
1 decade ago
@Rohit
It is impossible without assuming x i.e algebraic method, learn more on this.
It is impossible without assuming x i.e algebraic method, learn more on this.
Kajal said:
5 years ago
I'm not understanding this one I mean I don't get 1/2 by solving the equation.
Pulak sarkar said:
9 years ago
Downstream 4/x = 4/1/2 = 4*2 = 8kmph.
Upstream 3/x = 3/1/2 = 3*2 = 6kmph.
Upstream 3/x = 3/1/2 = 3*2 = 6kmph.
Rrr said:
4 years ago
@Raihan.
How do we solve those two equations? Please explain that too.
How do we solve those two equations? Please explain that too.
(3)
Jamshaid said:
3 years ago
How X/Y = 7?
By simplifying (X+Y) / (X-Y) = 4/3.
Please explain.
By simplifying (X+Y) / (X-Y) = 4/3.
Please explain.
(3)
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