47.A
boat running downstream covers a distance of 16 km in 2 hours while for
covering the same distance upstream, it takes 4 hours. What is the speed of the
boat in still water?
[A]
4 km/hr
[C]
8 km/hr
[B]
6 km/hr
[D]
Data inadequate
Answer : [B]
Explanation :
|
Rate
downstream =
|
|
16
|
|
kmph
= 8 kmph; Rate upstream =
|
|
16
|
|
kmph
= 4 kmph
|
2
|
4
|
|
|
|
|
|
Speed
in still water =
|
1
|
|
(8
+ 4) kmph = 6 kmph
|
|
2
|
|
|
