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 12 of 12.
Chandu said:
2 months ago
Upstream = boat - stream.
Downstream = boat + stream.
Distance is the same in both cases.
So,D(u.s) = D(d.s).
S×t = s × t.
(Boat+stream) × 8.8h = (boat - stream) × 4h.
Which gives the ratio.
Downstream = boat + stream.
Distance is the same in both cases.
So,D(u.s) = D(d.s).
S×t = s × t.
(Boat+stream) × 8.8h = (boat - stream) × 4h.
Which gives the ratio.
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