Aptitude - Boats and Streams - Discussion
Discussion Forum : Boats and Streams - General Questions (Q.No. 3)
3.
A boat running upstream takes 8 hours 48 minutes to cover a certain distance, while it takes 4 hours to cover the same distance running downstream. What is the ratio between the speed of the boat and speed of the water current respectively?
Answer: Option
Explanation:
Let the man's rate upstream be x kmph and that downstream be y kmph.
Then, distance covered upstream in 8 hrs 48 min = Distance covered downstream in 4 hrs.
 |
 |
x x 8 | 4 |  |
= (y x 4) |
| 5 |
| |
44 | x =4y |
| 5 |
| y = |
11 | x. |
| 5 |
 Required ratio = |
|
y + x | |
: | |
y - x | |
| 2 | 2 |
| = | |
16x | x | 1 | |
: | |
6x | x | 1 | |
| 5 | 2 | 5 | 2 |
| = | 8 | : | 3 |
| 5 | 5 |
= 8 : 3.
Discussion:
111 comments Page 7 of 12.
Anchal said:
1 decade ago
I am not able to understand the required ratio. ? how it is related with the speed of boat to speed of water. ?
Sandeep said:
1 decade ago
x/y = 5/11.
So, x=5 , y=11.
(x+y)/2 : (x-y)/2.
(11+5)/2 : (11-5)/2.
16/2 : 6/2.
8:3 answer.
So, x=5 , y=11.
(x+y)/2 : (x-y)/2.
(11+5)/2 : (11-5)/2.
16/2 : 6/2.
8:3 answer.
BHASKAR said:
8 years ago
Required ratio =(x+y)/2 : (x-y)/2 // here 2 is to take average.
Please, Explain this.
Please, Explain this.
Siddharth said:
8 years ago
It's very easy and understandable method. Thank you very much for this solution BINDU.
Pankaj said:
1 decade ago
@ prasanth
binza concept is correct,but i still does't understand the avg?????
binza concept is correct,but i still does't understand the avg?????
Naren said:
9 years ago
8 hours 48 minutes is equal to 8.8 hours but how will it be equal to 6.4 hours?
Sriteja said:
8 years ago
@Sujishnu Adhya & @Binza.
Your explanation made me easy to understand. Thanks.
Your explanation made me easy to understand. Thanks.
BHASKAR said:
8 years ago
Required ratio = (x+y)/2 : (x-y)/2 // here 2 is to take average.
Explain this.
Explain this.
Pavan chennur said:
7 years ago
Distance is constant. So that we have a relationship between speed and time.
Rajver said:
9 years ago
I did not understand anything. Please let me know the easy way for this?
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