Aptitude - Boats and Streams - Discussion
Discussion Forum : Boats and Streams - General Questions (Q.No. 12)
12.
A man can row three-quarters of a kilometre against the stream in 11
minutes and down the stream in 7
minutes. The speed (in km/hr) of the man in still water is:
minutes and down the stream in 7 minutes. The speed (in km/hr) of the man in still water is:Answer: Option
Explanation:
We can write three-quarters of a kilometre as 750 metres,
and 11 minutes as 675 seconds.
| Rate upstream = |  |
750 |  m/sec |
= | 10 | m/sec. |
| 675 | 9 |
| Rate downstream = | |
750 | m/sec |
= | 5 | m/sec. |
| 450 | 3 |
 Rate in still water = |
1 | |
10 | + | 5 | m/sec |
| 2 | 9 | 3 |
| = | 25 | m/sec |
| 18 |
| = | |
25 | x | 18 | km/hr |
| 18 | 5 |
= 5 km/hr.
Discussion:
42 comments Page 3 of 5.
Sriteja said:
8 years ago
Anyone, please explain conversion from meters to kilometers in this problem.
Bijendra Singh said:
1 decade ago
Downstream time is given there 7 1/2 so it is 15/2*60.
i.e. 900/2 = 450
i.e. 900/2 = 450
Prachiti said:
9 years ago
How to solve this question if the rate for going downstream is not given?
Neelam said:
1 decade ago
How we find downstream time as it is not mention in the question?
Buny said:
10 years ago
How to find time of download stream? How it is calculated 15/2?
Ashoka said:
9 years ago
From the last second step 25/18 * 18/5 from where 18/5 came?
Gulam said:
2 decades ago
how to find it minutes to millisecond
plz reply me
Thanks
plz reply me
Thanks
Malay said:
5 years ago
Don't understand this sum, how to find the speed of man?
(1)
Rakesh said:
7 years ago
How come to down stream? Anyone help me to get it.
Jyoti said:
1 decade ago
How does 3 quarters of kilometers is converted?
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