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:
109 comments Page 3 of 11.
Nitin Gusain said:
1 decade ago
Take it as in easy way
x= upstream speed
y= downstream speed
now we know that
upstream speed(x) = boat speed - stream speed
downstream speed(y) = boat speed + stream speed
so, x+y = 2*boat speed
x-y = 2*stream speed
so ratio of boat speed to stream speed is = (x+y)/(x-y)
x= upstream speed
y= downstream speed
now we know that
upstream speed(x) = boat speed - stream speed
downstream speed(y) = boat speed + stream speed
so, x+y = 2*boat speed
x-y = 2*stream speed
so ratio of boat speed to stream speed is = (x+y)/(x-y)
Aag said:
1 decade ago
I got 13:3 please help I'm not getting 8:3.
Srinu said:
1 decade ago
I didn't understand how 8*4/5 will get.
Anbu said:
1 decade ago
Bindu your answer is suitable for all this type of problems?
Anbu said:
1 decade ago
@Bindu.
Your answer is suitable for all this type of problems?
Your answer is suitable for all this type of problems?
Hema said:
1 decade ago
I'm not understand this step 16/5*1/2 please help me.
Ashwini said:
1 decade ago
@Nitin Gusain.
Thanks yaar. It's so simple calculation.
But X-Y = -2 (Stream speed) So instead of that,
Y-X = +2 (Stream speed).
Thanks yaar. It's so simple calculation.
But X-Y = -2 (Stream speed) So instead of that,
Y-X = +2 (Stream speed).
Maneesh said:
1 decade ago
Simply equal the speeds in downstream and upstream we get the ratio,
upstream:downstream.
(x+y)/2 = (x-y)/2
(x+y) = (x-y)
Given upstream and downstream speeds,
Means x(44/5)=y(4).
y = x(11/5)
(x+Y) = (x-Y)
16x/5 = 6x/5
8:3 answer
upstream:downstream.
(x+y)/2 = (x-y)/2
(x+y) = (x-y)
Given upstream and downstream speeds,
Means x(44/5)=y(4).
y = x(11/5)
(x+Y) = (x-Y)
16x/5 = 6x/5
8:3 answer
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.
Raju said:
1 decade ago
I want to know how these equation is done?
16x/5 and 6x/5.
16x/5 and 6x/5.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers