73.A
man can row three-quarters of a kilometer against the stream in 11 1
minutes.
4
The
speed (in km/hr) of the man in still water is:
[A]
2
[C]
4
[B]
3
[D]
5
Answer : [D]
Explanation :
|
|
|
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 =
|
25
|
m
/ sec. =
|
|
25
|
x
|
18
|
|
km
/ hr
|
|
|
2
|
9
|
3
|
18
|
18
|
5
|
|
|
|
|
|
|
