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 5 of 5.
Dilip Kumar said:
5 years ago
@MGanesh.
How did you take 3/4/15/2*60?
How did you take 3/4/15/2*60?
(1)
Laxman Pawar said:
5 years ago
When we cross multiply, we should get as 10.
15/2*3/4 = 10,
45/4*4/3 = 15,
10-15 = 5,
So, the Answer is 5.
15/2*3/4 = 10,
45/4*4/3 = 15,
10-15 = 5,
So, the Answer is 5.
(3)
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