8.
A boat takes 4 hours for travelling downstream from point A to point B aild
coming back to point A upstream. If the velocity of the stream is 2 kmph and
the speed of the boat in still water is 4 kmph, what is the distance between A
and B? . [Bank P0. 1991]
4
kms 8 km
6
km 9 km
Answer: 6 km
Explanation: Let the distance between A and B be
x km.
Speed
downstream = 6 kmph, speed upstream = 2 kmph.
(x/6)
+ (x/2) = 4 4x = 24 hence x = 6
Distance
AB = 6 km
